Expedition 357 Scientists (2017): Description of lithologic section units of IODP Hole 357-M0076B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.872042
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Related to:
Frueh-Green, Gretchen L; Orcutt, Beth N; Green, Sophie; Cotterill, Carol; Expedition 357 Scientists (2016): Atlantis Massif Serpentinization and Life. International Ocean Discovery Program Preliminary Report, International Ocean Discovery Program, https://doi.org/10.14379/iodp.pr.357.2016
Further details:
Project(s):
Coverage:
Latitude: 30.127020 * Longitude: -42.117750
Date/Time Start: 2015-11-15T00:00:00 * Date/Time End: 2015-11-17T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 15.411 m
Event(s):
357-M0076B (AM-11A) * Latitude: 30.127020 * Longitude: -42.117750 * Date/Time Start: 2015-11-15T00:00:00 * Date/Time End: 2015-11-17T00:00:00 * Elevation: -768.0 m * IGSN: IBCR0357EHX0001 * Location: Atlantis Massif * Campaign: Exp357 * Basis: James Cook * Comment: RD2
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Expedition 357 Scientists | DSDP/ODP/IODP sample designation | ||
| 2 | Lithologic unit/sequence | Unit | Expedition 357 Scientists | Visual description | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Expedition 357 Scientists | Geocode | |
| 4 | Rock type | Rock | Expedition 357 Scientists | Visual description | ||
| 5 | Main Lithology | Main lith | Expedition 357 Scientists | Visual description | ||
| 6 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | ||
| 7 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | Continuation 1 | |
| 8 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | Continuation 2 | |
| 9 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | Continuation 3 | |
| 10 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | Continuation 4 | |
| 11 | Lithology/composition/facies | Lithology | Expedition 357 Scientists | Visual description | Continuation 5 | |
| 12 | Core disturbance | Disturbance | Expedition 357 Scientists | Visual description | ||
| 13 | Percentage | Perc | % | Expedition 357 Scientists | Visual description | Main lithology |
| 14 | Comment | Comment | Expedition 357 Scientists | Visual description | ||
| 15 | Color code HLS-system | Color HLS | Expedition 357 Scientists | Munsell Color System (1994) | ||
| 16 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture and foliation | |
| 17 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins | |
| 18 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins, continuation | |
| 19 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture morphology | |
| 20 | Minerals | Minerals | Expedition 357 Scientists | Visual description | ||
| 21 | Alteration | Alteration | Expedition 357 Scientists | Visual description |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
290 data points
Data
| 1 Sample label (DSDP/ODP/IODP sample designation) | 2 Unit (Visual description) | 3 Depth sed [m] | 4 Rock (Visual description) | 5 Main lith (Visual description) | 6 Lithology (Visual description) | 7 Lithology (Continuation 1, Visual descri...) | 8 Lithology (Continuation 2, Visual descri...) | 9 Lithology (Continuation 3, Visual descri...) | 10 Lithology (Continuation 4, Visual descri...) | 11 Lithology (Continuation 5, Visual descri...) | 12 Disturbance (Visual description) | 13 Perc [%] (Main lithology, Visual descri...) | 14 Comment (Visual description) | 15 Color HLS (Munsell Color System (1994)) | 16 Structure (Fracture and foliation, Visua...) | 17 Structure (Veins, Visual description) | 18 Structure (Veins, continuation, Visual d...) | 19 Structure (Fracture morphology, Visual d...) | 20 Minerals (Visual description) | 21 Alteration (Visual description) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 357-M0076B-1R-1,0 | 1 | 0.000 | Sediment | Polymict breccia | Basalt-dominated carbonate breccia. Clasts are metagabbro, basalt, and a fragment of a breccia. The metagabbro includes dark cores (olivine?) surrounded by white minerals (10%), plagioclase (45%), and clinopyroxene (45%). The basalt contains 3-4% of | vesicules (up to 1mm in size) and is slightly oxidized along the edges. The fragment of carbonate breccia has matrix rich in foraminifera and includes clasts of serpeninite, talc-schist, and basalt. | 90 | Minerals: Carbonate; Clinopyroxene; Fe-Ti oxides; Orthopyroxene; Plagioclase; Serpentine; Talc | ||||||||||||
| 357-M0076B-2R-1,0 | 1 | 1.719 | Metamorphic/Fault Rock | Talc-amphibole schist | Fragments of gabbro in a talc-amphibole schist. Intervals of oxidized, serpentinized harzburgite at 19-25cm and 44-46cm. The gabbro is coarse-grained with large oxides and amphibole, plagioclase and pyroxene could be identified. The higly oxidized | serpentinite contains relict pyroxenes and oxides. | 80 | 5G 6/2 | Structures: Foliation=2 -- Moderately foliated | Minerals: Amphibole; Clinopyroxene; Magnetite; Orthopyroxene; Oxides; Plagioclase; Serpentine | Very high alteration | |||||||||
| 357-M0076B-2R-1,46 | 2 | 2.179 | Metamorphic/Fault Rock | Metagabbro | Highly fractured metagabbro, variably altered to talc-amph schist. | 100 | 10YR 4/1 | Minerals: Clinopyroxene; Orthopyroxene; Oxides; Plagioclase | Slight alteration | |||||||||||
| 357-M0076B-2R-1,58 | 3 | 2.299 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Oxidized, porphyroclastic, serpentinized harzburgite. Three generations of serpentine veins of various color are visible. Porphyroclasts to 7x10mm, modal abundance 15%. | 100 | 5G 2.5/2 | Structures: Veins=3 -- 5-10 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=1 -- Isolated; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Magnetite; Oxides; Serpentine | Total alteration | |||||||||
| 357-M0076B-2R-2,0 | 1 | 2.449 | Sediment | Polymict breccia | Brecciated talc-rich cataclasite with fragments up to 7cm in-situ (matrix Munsell 10Y 6/2). Fragments are dominanted by talc and serpentine. | moderately | 100 | 5G 8/2 | Minerals: Amphibole; Chlorite; Oxides; Talc | High alteration | ||||||||||
| 357-M0076B-3R-1,0 | 1 | 3.439 | Rubble | Mixed rubble | Rubble of oxidized serpentinite, talc-amphibole schist, and metagabbro (with coarse pyroxene preserved) that is locally also altered to talc-amphbibole schist. Locally highly oxidized serpentinite is found that preserves the same texture as in the | next unit of this core. | highly | 100 | 10GY 2.5/1 | Minerals: Amphibole; Chlorite; Clinopyroxene; Oxides; Serpentine; Talc | High alteration | |||||||||
| 357-M0076B-3R-1,49 | 2 | 3.929 | Metamorphic/Fault Rock | Serpentinized harzburgite | Serpentinized harzburgite comprising a distinct alteration (oxidation) zone with green serpentine preserved along the edge. A set of parallel serpentine veins partly penetrates the oxidation front. Where they enter the oxidation front the vein color | changes from white to orange (the veins were likely present prior to oxidation). Thin section at 51-54.5 contains an oxidised path in talc rock merging into a chlorite-rich zone. | 100 | 2.5YR 2.5/1 | Structures: Veins=3 -- 5-10 per 10cm | Veins: Shape=1 -- Straight/planar; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=3 -- Composite | Minerals: Hydroxides; Oxides; Serpentine | Total alteration | ||||||||
| 357-M0076B-3R-1,70 | 3 | 4.139 | Metamorphic/Fault Rock | Serpentinized dunite | Highly oxidized and serpentinized dunite with a well developed and well preserved mesh texture. Locally magnetite veins are visible. | 100 | Structures: Veins=3 -- 5-10 per 10cm; Foliation=0 -- Massive | Veins: Shape=3 --Irregular; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Hydroxides; Oxides; Serpentine | |||||||||||
| 357-M0076B-4R-1,0 | 1 | 5.159 | Rubble | Mixed rubble | Rubble of talc-amphibole-chlorite schist, (locally oxidized) serpentinite and metagabbro. Locally serpentinite clasts contain brittle fractures. | highly | 100 | 10BG 5/1 | Structures: Open fractures=1 -- <1 per 10cm | Minerals: Amphibole; Chlorite; Hydroxides; Oxides; Serpentine; Talc | High alteration | |||||||||
| 357-M0076B-4R-1,51 | 2 | 5.669 | Metamorphic/Fault Rock | Serpentinized harzburgite | Oxidized, serpentinized harzburgite locally containing magmatic veins; crosscut by talc-rich vein at 119-127cm. Strongly veined towards the end of section. Bastite approx 15% modally, to 6x10mm. XRD 92-95cm: 75% serp, 6% tlc, 16% chl, 2% oxides. | Thin section 92-95cm Serpentinised peridotite with deformed orthopyroxene cut by steep chlorite/serpentine and shallow fibrous serpentine (?) veins. Minor amphibole in places. | highly | 100 | 2.5YR 2.5/3 | Minerals: Magnetite; Oxides; Serpentine | Total alteration | |||||||||
| 357-M0076B-4R-2,0 | 1 | 6.459 | Metamorphic/Fault Rock | Serpentinized harzburgite | Oxidized serpentinized harburgites crosscut by sub-vertical talc-rich vein (270-80cm) crosscutting by sub-horizontal late veins.The undeformed to slightly deformed serpentinized harzburgites show oxidated mesh texture. The cataclasis is concentrated along | the veins. In details it seems that the sub-vertical tc vein is parallel to a sub-vertical melt intrusion (light brown in color) crosscutting it and penetrating into the harzburgites. Opx-bastite are sourronded by thin rim of this talc-rich material. | Late sub-horizontal veining (pale green, massive) crosscuts everything. Thin section at 19-22cm is 100% serpentinised harzburgite | To BE Finish by Chiara ! | ||||||||||||
| 357-M0076B-4R-3,0 | 1 | 6.829 | Metamorphic/Fault Rock | Serpentinized harzburgite | One large fragment of oxidised serpentinized harzburgite, nearly idential to the preceding section (76B-4R2) | |||||||||||||||
| 357-M0076B-5R-1,0 | 1 | 6.729 | Metamorphic/Fault Rock | Serpentinized dunite | 0-36cm MBIO 36-72cm: Serpentinized dunite. high degree of serpentinization. No relics of primary minerals. Partially sheared mesh texture, no bastite. Strong pervasive oxidation, especially concentrated along the rims of the mesh texture. | Fracture network exploited by veins. Veins (talc, serp, late cc) are irregualr, but mostly sub-horizontal. Late crack open, 090/70 apparent, 090/30 irregular. At 38cm a fault has a true dip of 10 towards 060. | A lineation on the fault plane plunges at 05 towards 305 (measured on working half during sample cutting) 56-63cm: small discontinuous intrusion? | Structures: Open fractures=1 -- <1 per 10cm; Veins=5 -- >20 per 10cm | Veins: Shape=3 --Irregular; Connectivity=4 -- Network; Connectivity=6 -- Cross cutting; Connectivity=8 -- Parallel; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Irregular | Minerals: Magnetite; Other; Serpentine; Talc; Tremolite | |||||||||
| 357-M0076B-5R-1,72 | 2 | 7.449 | Metamorphic/Fault Rock | Metagabbro | The metagabbro/mafic intrusion consists of concentric layers of yellow schistose fine-grained materials (with Af foliation) and a black cataclastic zone of elongated grains.Intervals of porphyroclastic serpentinized harzburgite at 86-92cm, 101-114cm, | 121-125cm. Mesh texture strongly oxidised; bastite 5-10% up to 5x15mm, most <5mm.Few late gren talc-serp veins. At the top altered green layer (2cm) that outlines the contact between serpentinized dunite and metagabbro (to be defined after XRD) | XRD: 72-73cm - serp 19%, tlc 15%, amph 60%, chl 6%. XRD: 115-116cm - serp 10%, tlc 55%, amph 14%, chl 14%, clay 7%. XRD: 119-120cm - serp 4%, tlc 68%. Thin scetion 73-77 is sheared metagabbro with coarse green (hornblende?) amphiboles and chlorite, | invaded by a possible basaltic vein. Talc alteration at one end of the slide | Mineral assemblage to be defined after XRD | Structures: Open fractures=1 -- <1 per 10cm; Veins=3 -- 5-10 per 10cm; Veins=4 -- 10-20 per 10cm; Veins=5 -- >20 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated; Cataclastic deformation=2 -- Moderate fracturing | Veins: Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=4 -- Network; Connectivity=8 -- Parallel; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Irregular | Minerals: Amphibole; Bastite; Magnetite; Other; Serpentine; Talc; Tremolite | |||||||
| 357-M0076B-5R-2,0 | 1 | 7.979 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Fragments of porphyroclastic serpentinizad harburgite, same as 5R1 Unit 2 intervals of serpentinized harzburgite. Bastite up to 7x7mm, 20% modal abundance. | Structures: Open fractures=1 -- <1 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=1 -- Straight/planar; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Irregular | Minerals: Bastite; Magnetite; Other; Serpentine | |||||||||||
| 357-M0076B-6R-1,0 | 1 | 7.984 | Metamorphic/Fault Rock | Serpentinized harzburgite | Serpentinized harzburgite with some melt intrusions and localized talc-rich metasomatic alteration. The unit is strongly fractured (drilling induced?); the fracturation is mainly concentrated in the talc-rich metasomatic rims/areas. Serpentinites, | harzburgites: opx 3-5mm mode 5-10 %. Mesh texture after ol very oxided (no oxidation on bastite) 1-5cm metasomatic talc-rich sheared rim to most of the serpentinite clasts. 75cm-END, different melt intrusions intruded the harzburgites. | Deformation Sub-vertical shear zone along tc-tr veins with shistose texture and cataclastic deformation (clast reworked in shear zone). Broad tc-tr shear zone at 72-110cm, possibly deformed later with possible fault gouge and broken-up peridotite. | Overall vein intensity 5.mm size pale green talc-amph veins (usually crosscutting vertical) A faulted vein between 6 and 30cm dips at 75 towards 090, with chrystotile fibres plunging at 10 towards 010. A shear zone between 33 and 38cm dips at 60 | towards 325 and a lineation plunges at 20 towards 245 (measurements made on working half during sampling) XRD: 21-24cm - serp 10%, tlc 47%, amph 23%, chl 10%, clay 11%. XRD: 96-97cm - serp 68%, chl 15%, clay 6%, oxides, hydroxides. | XRD: 102-103cm - serp 17%, tlc 70%, chl 13%. Thin section at 21-24cm is a highly oxidised talc-rich fault rock of uncertain protolith. | Different XRD to look at. | Structures: Open fractures=1 -- <1 per 10cm; Veins=5 -- >20 per 10cm; Foliation=0 -- Massive; Foliation=2 -- Moderately foliated | Veins: Shape=2 -- Sigmoidal/ curved; Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Irregular | Minerals: Amphibole; Hydroxides; Other; Serpentine; Talc; Tremolite | |||||
| 357-M0076B-7R-1,0 | 1 | 9.724 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Porphyroclastic serpentinized harzburgite. Opx-bastite= 1-6mm, mode 5-10%.In most of the unit the mesh texture is difficult to see: oxidation, very fine-grained or totally recrystallized? 91cm-END: MBIO Several melt intrusions into the unit. | E.g.: -Middle point around 20cm: orientation 120/80 real - Middle point around 40cm (TS) The melt intrusions are sourrounded or intruded by late metasomatic green talc-serp rich alteration Fracturing along magmatic and methamorphic veins. | Fracturing associated with multiple phases vein growth. At 63cm vein and fracture 010/70 real. From 70cm to the bottom >10 veinlets. XRD: 26-28cm - serp 9%, talc 90%, hydroxides. XRD: 81-83cm - serp 63%, chl 27%, carb 5%, hydroxides. Thin section | at 80-83cm is a 100% serpentinised harrburgite cut by a thick serpentine vein with complex textures Thin section at 34-35cm is an amphibole chlorite schist with some talc. Patches of flattened chlorite suggest it may be in part metagabbro (chlorite | typically after plagioclase). Thin section at 42-44.5cm is harzburgite, largely serpentinised, with orthopyroxene ofetn altered to talc. horizontal talc veins cut a steep serpentine vein which appears to be on the edge of a highly altered (to chlorite and | amphibole) gabbroic vein. Some rubble intervals (most probably induced by drilling): 0-8cm - rubble (to 2cm) 8-31cm - one coherent piece 31-40cm - slightly bigger rubble (to 5cm) 40-48cm - one piece 48-52cm - rubble (to 3cm) 52-END - several big pieces. | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=2 -- Cross fiber; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Irregular | Minerals: Amphibole; Magnetite; Other; Oxides; Serpentine; Talc; Tremolite | ||||||
| 357-M0076B-7R-2,0 | 1 | 10.924 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Clasts of oxidized porphyroclastic serpentinized harzurgites. Clasts size mostly <0.5mm. 3 bigger clasts (2-3cm). Opx 1-4mm, most <2mm. Variably altered to talc-amph schist. | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=0 -- No veins | Fractures: Morphology=No open fractures | Minerals: Amphibole; Magnetite; Other; Serpentine; Talc | |||||||||||
| 357-M0076B-8R-1,0 | 1 | 11.154 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Relic opx (bastite) from 1mm-8mm, most<4mm, mode 5-10%. Melt intrusion and late talc-amphibole-chlorite alteration. Mesh texture not observed, maybe oxidised? TS and XRD requested. 0-25cm: Rubble mostly of porphyroclastic serpentinized harburgites. No | schistosity. 25-50cm: Coherent angular pieces of serpentinized harzurgite. Very few fractures. Schistosity 1 in amphibole veins (27-50) sub vertical. XRD: 42-44cm - serp 74% clay 16%, carb 6%. Thin section at 42-44.5cm is serpentinised peridotite. | Chlorite patches may be gabbroic plagioclase impregnation. Steep serpentine veins are cut by horizontal composite fibrous veins with serpentine and a higher birefringence mineral. Note XRD shows clay minerals not chlorite | Structures: Open fractures=1 -- <1 per 10cm; Veins=4 -- 10-20 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=2 -- Sigmoidal/ curved; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=4 -- Network; Connectivity=6 -- Cross cutting; Texture=1 -- Massive; Texture=5 -- Polycrystalline; | Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Bastite; Chlorite; Hydroxides; Other; Oxides; Serpentine; Talc; Tremolite | ||||||||
| 357-M0076B-8R-1,50 | 2 | 11.654 | Metamorphic/Fault Rock | Talc-amphibole schist | At the top of the unit there is a gabbroic intrusion (50-60cm) transitioning to talc-amphibole rich schist (protolith only gabbro or mix with serp from the unit below?), with increasing the degree of metasomatism moving away fromn the gabbro. At the top | dark green flat vein cracked open 090/20. The schistosity of the talc-amphibole schist is 3, with rather angular gabbroic clasts. Drilling induced rotation possible between above and below 95cm. | At 53cm a fault dips at 13 towards 090 with a lineation 12/295 | Structures: Open fractures=1 -- <1 per 10cm; Veins=4 -- 10-20 per 10cm; Foliation=1 -- Weakly foliated; Foliation=3 -- Strongly foliated | Veins: Shape=3 --Irregular; Connectivity=4 -- Network; Connectivity=8 -- Parallel; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Irregular | Minerals: Amphibole; Chromite; Other; Oxides; Talc; Tremolite | |||||||||
| 357-M0076B-8R-1,82 | 3 | 11.974 | Metamorphic/Fault Rock | Serpentinized harzburgite | Oxidized serpentinized harzurgite. The first fragment has likely been rotated during drilling. The size of the mesh core decreases toward the bottom of the core. Strong oxidation of the mesh texture (more altered than unit 1). 15% bastite, | 2-5mm, most <2mm. Lots of green fractures and carbonate veins below 11cm. Some metasomatic green talc-rich veins that are re-used for late thin white carbonate veins (mostly 90-15). At 92cm a fault vein dips at 48 towards 270 with a lineation | plunging 33 towards 225 | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=5 -- >20 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=4 -- Network; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=5 -- Polycrystalline; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Irregular | Minerals: Bastite; Carbonate; Hydroxides; Magnetite; Other; Serpentine; Talc | |||||||||
| 357-M0076B-9R-1,0 | 1 | 12.874 | Metamorphic/Fault Rock | Serpentinized harzburgite | Unit 1 (of 1): 0-34cm, highly oxidized, porphyroclastic, serpentinized harzburgite/px-poor dunite. Rubble on top with talc-amphibole-chlorite alteration. From 14cm, three larger coherent pieces of Unit 1, plus pebble. Alteration: Very altered and | oxidized. Fine-grained mesh texture. Pockets of talc-rich material. Oxidixed calcite veins. Opx/bastite, mode: 5%, up to 3mm, most <2mm. From, 16-34cm, lithology may better described as a px-poor dunite. Structure: highly cataclastic, fractured, | with no deformation. More composition along veins. No preferred orientation of fractures. 34-64cm: MBIO (checked, likely same serpentinized harzburgite material). 64-103cm: Same as above, Cut by oxidized carbonate vein. Bastite (green), | mode: 5%, 2-10mm. XRD: 17-18cm - serp 55%, clay 8%, carb 30%, oxides 5%. Thin section at 14-17.5cm is serpentinized harzburgite with subrounded chrome spinel. Orange vein is serpentine/clay minerals. Carbonate veins are common. | Structures: Open fractures=1 -- <1 per 10cm; Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive | Veins: Shape=3 --Irregular; Connectivity=4 -- Network; Texture=5 -- Polycrystalline; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Bastite; Calcite; Chlorite; Other; Oxides; Serpentine; Talc | ||||||||
| 357-M0076B-9R-2,0 | 1 | 13.904 | Metamorphic/Fault Rock | Serpentinized dunite | Similar to 9R-1. Serpentinized dunite with some bastites. Bastite 2-6mm, most 3mm; mode 5%. | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=0 -- No veins; Foliation=0 -- Massive | Veins: Shape=0 -- No veins | Fractures: Morphology=Irregular | Minerals: Bastite; Other; Serpentine; Talc | |||||||||||
| 357-M0076B-10R-1,0 | 1 | 14.591 | Rubble | Serpentinite rubble | Rubble of serpentinised harzburgite. Variably oxidised. Piece of 3mm carbonate vein | Veins: Shape=1 -- Straight/planar; Connectivity=1 -- Isolated; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Calcite; Magnetite; Serpentine | |||||||||||||
| 357-M0076B-10R-1,17 | 2 | 14.761 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Serpentinised porphyroclastic harzburgite with weak shallow dipping fabric. Bastites typically 5-10mm, 20-25%. Cross-cutting veins of carbonate and serpentine with carbonate veins later | 100 | Structures: Veins=2 -- 1 - 5 per 10cm; Peridotite crystal-plastic deformation=1 -- Porphyroclastic weakly foliated | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=3 -- Composite | Minerals: Calcite; Magnetite; Serpentine | |||||||||||
| 357-M0076B-10R-1,44 | 3 | 15.031 | Rubble | Serpentinite rubble | Serpentinised harzburgite fragments | 100 | Minerals: Magnetite; Serpentine | |||||||||||||
| 357-M0076B-10R-1,51 | 4 | 15.101 | Metamorphic/Fault Rock | Serpentinized dunite | Serpentinized dunite with mesh texture. Branching carbonate veins. | Structures: Veins=2 -- 1 - 5 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=3 -- Composite | Minerals: Carbonate; Magnetite; Serpentine | ||||||||||||
| 357-M0076B-10R-1,62 | 5 | 15.211 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Weakly foliated porphyroclastc harzburgite with mesh texture, strongly oriented below 75cm. Network of carbonate and other veins along possible fault zone 56-60cm. 5mm carbonate vein at 66cm and various steep carbonate veins, some containing sulphides. | 100 | Structures: Veins=2 -- 1 - 5 per 10cm; Foliation=1 -- Weakly foliated | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Carbonate; Magnetite; Serpentine | |||||||||||
| 357-M0076B-10R-1,82 | 6 | 15.411 | Metamorphic/Fault Rock | Serpentinized dunite | Fractured serpentinised dunite breaking down into fragments. MBIO at 91cm. | Structures: Open fractures=3 -- >5 per 10cm | Fractures: Morphology=Irregular; Network morphology=Anastomosing | Minerals: Magnetite; Serpentine |