Expedition 357 Scientists (2017): Description of lithologic section units of IODP Hole 357-M0069A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.872029
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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: 30.132400 * Longitude: -42.120030
Date/Time Start: 2015-11-06T00:00:00 * Date/Time End: 2015-11-08T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 16.290 m
Event(s):
357-M0069A (AM-06A) * Latitude: 30.132400 * Longitude: -42.120030 * Date/Time Start: 2015-11-06T00:00:00 * Date/Time End: 2015-11-08T00:00:00 * Elevation: -850.9 m * IGSN: IBCR0357EHA0001 * Location: Atlantis Massif * Campaign: Exp357 * Basis: James Cook * Comment: RD2, CTD: 30 7.985N / 42 7.218W; back on deck 10:30; MeBo launched 12:26, failed, back on deck 15:00; launch RD2 at midnight
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 | Fracture and foliation, continuation | |
| 18 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins | |
| 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:
292 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 (Fracture and foliation, conti...) | 18 Structure (Veins, Visual description) | 19 Structure (Fracture morphology, Visual d...) | 20 Minerals (Visual description) | 21 Alteration (Visual description) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 357-M0069A-1R-1,0 | 1 | 0.000 | Sediment | Calc sedim w/ lithic fragments | Pelagic carbonate sand with fine-grained lithic fragments (<2mm), including some rare basaltic fragments (large basaltic clast at 86-89cm). | 100 | Minerals: Carbonate | |||||||||||||
| 357-M0069A-2R-1,0 | 1 | 1.720 | Sediment | Calc sedim w/ lithic fragments | Pelagic carbonate sand with fine-grained lithic fragments (<2mm). The interval betwen 0 and 4cm is slightly more coarse-grained than the lower sections. | 100 | Minerals: Carbonate | |||||||||||||
| 357-M0069A-4R-1,0 | 1 | 5.160 | Sediment | Calc sedim w/ lithic fragments | Pelagic carbonate sand with fine-grained lithic fragments, including basaltic fragments up to 4mm in size. | 100 | Minerals: Carbonate | |||||||||||||
| 357-M0069A-5R-1,0 | 1 | 6.880 | Rubble | Mixed rubble | Rubble, loose with angular fragments (to 4cm) of mostly serpentinized harzburgite.One piece is oxidized and contains pyrite. | 100 | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins | Veins: Shape=0 -- No veins | Fractures: Morphology=No open fractures | |||||||||||
| 357-M0069A-5R-1,13 | 2 | 7.010 | Metamorphic/Fault Rock | Serpentinized harzburgite | Piece of serpentinized harzburgite. Pale grey alteration of mesh texture; altered pyroxene is pale-green. A talc vein cuts at the lower end of the piece. XRD: 18-19cm - serp 25%, tlc 75%, magnetite 4%. Thin section at 14-19cm is a serpentinized | harzburgite partly replaced by talc | 95 | Check TS for more detail. | 10GY 2.5/1 | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins | Veins: Shape=0 -- No veins | Fractures: Morphology=No open fractures | Minerals: Magnetite; Serpentine; Talc | Total alteration | ||||||
| 357-M0069A-5R-1,20 | 3 | 7.080 | Metamorphic/Fault Rock | Metadolerite | Metagabbroic to metadoleritic unit with variations in grain-size and alteration intensity. 20-29cm: Metagabbro with relict cpx to 7mm. 29-35cm: Interval of metadolerite. Below, 35-62cm, metagabbro with magmatic or plastic foliation that is | sub-horizontal (270/10), and epidote patches between 35-49cm. At 57cm is a fault dipping 35/090 (true dip), with a lineation identified on the working half trending 00/150, 62-83cm: Metadolerite. 83-115cm: Metadolerite (described as metagabbro in VCD) | with alteration patches of light tone that were determined by XRD as almost exclusively consisting of chlorite, with abundant epidote veins at 91-115cm. 115-151cm: MBIO sample. 26-115cm: Pervasive cataclasis with no evidence of strain. Higly cataclased | (in association with the veining of epidote) from 100 to 115cm. Small, sub-millimetric disSeminated sulfides in the metadolerite. XRD: 41.5-42.5cm - amph 36%, chl 53%, serp 4%, clays. XRD: 110-113cm - chl 98%m. Thin section at 38-42.5cm is a sheared | breccia of amphibole schist pieces and metadolerite with abundant chilled margin material in clasts and probably intruded along the foliation. Epidote is common in metadolerite clasts. Thin section at 110 to 113cm contains metagabbro and | metadolerite replaced by chlorite and amphibole | 10YR 3/4 | Structures: Open fractures=1 -- <1 per 10cm; Veins=4 -- 10-20 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated; Cataclastic deformation=1 -- Minor fracturing; Cataclastic deformation=5 -- Cataclasite; | Magmatic foliation=1 -- Weak shape fabric | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Irregular; Network morphology=Splayed | Minerals: Amphibole; Chlorite; Clay minerals; Epidote; Sulfides | Very high alteration | |||
| 357-M0069A-6R-1,0 | 1 | 8.600 | Rubble | Dolerite rubble | Rubble of mostly meta-dolerite pieces up to 6cm in size, though, mostly between 0.5-2cm in size. | moderately | 100 | 10YR 3/4 | Minerals: Amphibole; Chlorite; Epidote; Other | High alteration | ||||||||||
| 357-M0069A-6R-1,24 | 2 | 8.840 | Metamorphic/Fault Rock | Metadolerite | Metadolerite. Alteration is mostly pervasive but stronger along veins. The veins are light brown to green with crystals of epidote locally visible. The veins have a halo that is variable in size and dominated by chlorite.Crosscutting relationships | were observed but no distinct generations could be determined. Epidote and chlorite were identified from thin section examination. Veins are less common from 24 to 60cm, and very abundant in intervals 73-97cm and 120 and 140cm. 25-28cm: Interval | of very fine-grained metadolerite in Semi-consolidated light green mud (Munsell 10Y6/2, present to 44cm). 29-42cm: Relatively shattered, fine-grained metadolerite. 37-41cm: 2 10x20mm coarser grained patches of possible metagabbroic material. 42-52cm. | Metadolerite has patchy brown alteration, which is seen again between 82 and 104cm. Abundant open fractures throughout, with epidote vein showing cataclastic deformation along them (23-64cm). XRD: 37-41cm chl 93%,+/- clays, epidote, amph. Thin section | at 37-41cm is a chlorite rich rock with some amphibole and epidote. Some spinel clasts. Cataclastic but weakly foliated with gouge on one end. It appears to be a highly chloritised metadolerite with broken up relics of epidote veins seen throughout | this core. | 100 | 10YR 3/4 | Structures: Veins=3 -- 5-10 per 10cm; Foliation=0 -- Massive | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=4 -- Haloed | Minerals: Amphibole; Chlorite; Clay minerals; Epidote | Very high alteration | ||||
| 357-M0069A-6R-2,0 | 1 | 10.030 | Metamorphic/Fault Rock | Metadolerite | Metadolerite with a network of epidote veins. Very similar to the sections above, with the dolerite being altered to mostly chlorite. | 80 | 10YR 3/4 | Structures: Veins=3 -- 5-10 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=4 -- Haloed | Minerals: Chlorite; Epidote; Other; Oxides | Very high alteration | |||||||||
| 357-M0069A-7R-1,0 | 1 | 10.320 | Metamorphic/Fault Rock | Talc-amphibole schist | Angular fragments of amphibole-dominated schist and metadolerite. Thin section at 6-7cm is strongly foliated amphibole-chlorite schist Semi-quant XRD: 6-7cm - chl (83), amph (17) | 60 | Minerals: Amphibole | |||||||||||||
| 357-M0069A-7R-1,8 | 2 | 10.400 | Metamorphic/Fault Rock | Amphibole-chlorite schist | Amphibole-chlorite schist with subhorizontal fabric including a 4cm interval of metadolerite. Smaller dolerite fragments are common especially at the base of the unit which is in sharp fault contact with metadolerite. In the top section of schist two | layers of predominantly tremolite in a flattened breccia and predominantly talc are separated by an elongate dolerite clast. Fabric in the lower layer truncates against the larger dolerite interval but there is no evidence for a chilled margin. At the | lower contact schist penetrates along fractures into the dolerite.Below the dolerite is a breccia of variably oriented amphibole-chlorite+/-talc schist clasts with increasing intensity of cataclasis towards the basal fault contact. A lineation prallel | to the cut surface can be seen on some visible foliation planes. Several shear sense indicators (bending of fabric, clast imbrication, and a shear band) agree that the sense of movement is top towards 090 in the core reference frame. | XRD: 6-7cm - chl 83%, amph 17% | 60 | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=0 -- No veins; Foliation=3 -- Strongly foliated; Cataclastic deformation=5 -- Cataclasite; Magmatic foliation=0 -- Isotropic: no shape fabric | Veins: Shape=0 -- No veins | Fractures: Morphology=Irregular | Minerals: Chlorite; Talc; Tremolite | ||||||
| 357-M0069A-7R-1,21 | 3 | 10.530 | Metamorphic/Fault Rock | Metadolerite | This section is highly fractured but contains intact drilled pieces between 35 and 45cm.Dolerite is assumed to be metamorphosed based on thin section description in other cores. There is a decrease in primary grain size from 40 to 21cm but no chilled | margin and the contact with the overlying unit is a fault. A short interval of talc-tremolite schist at 48-50cm may be an inclusion (xenolith) in the dolerite or may mark the boundary (screen) between two intrusive units. | The microbiology sample at the base of the core is highly fractured and appears to be more heterogeneous with green veins in some pieces. | 100 | Structures: Open fractures=3 -- >5 per 10cm; Veins=0 -- No veins; Foliation=0 -- Massive; Cataclastic deformation=1 -- Minor fracturing; Magmatic foliation=0 -- Isotropic: no shape fabric | Veins: Shape=0 -- No veins | Fractures: Morphology=Irregular; Network morphology=Anastomosing | Minerals: Amphibole; Plagioclase | ||||||||
| 357-M0069A-8R-1,0 | 1 | 11.320 | Metamorphic/Fault Rock | Metadolerite | Fractured metadolerite - a more coherent section continuing from 69A-7R. The metadolerite is aphyric and microcrystalline (0.1-0.5mm) and gerally relatively fresh. Locally (at intervals 0-10cm and 53-58cm) brown-green veins cut the dolerite. | The veins have been identified as epidote with a halo of variable size comprising of epidote and chlorite. At interval 35-37cm a small patch of talc-amphibole-schist occurs. This patch may possibly be interpreted as a xenolith within the dolerite. | Possible interpretation: multiple intrustions - some possible chilled margins with altered glassy sections, likely igneous contacts. | highly | 100 | 10YR 3/4 | Structures: Veins=2 -- 1 - 5 per 10cm | Minerals: Amphibole; Chlorite; Epidote; Plagioclase | Moderate alteration | |||||||
| 357-M0069A-8R-1,96 | 2 | 12.280 | Metamorphic/Fault Rock | Talc-amphibole-chlorite schist | Highly foliated mylonitic to cataclastic chlorit-amphible schist. At interval 135-140cm a dolerite appears to infiltrate the schist.Locally the chlorite-amphibole schist contains patches of talc. Thin section at 117-119cm is a flattened breccia of | talc-amphibole-chlorite schist. The rock is ~50% talc but the absence of obvious chromite and the presence of several large patches of chlorite (often after plagioclase) suggests a gabbroic protolith in part. | 90 | 10BG 7/1 | Structures: Foliation=3 -- Strongly foliated | Minerals: Amphibole; Chlorite; Oxides; Talc | Total alteration | |||||||||
| 357-M0069A-8R-1,150 | 3 | 12.820 | Rubble | Talc-amphibole schist rubble | Thin zone of schist rubble. | 100 | Minerals: Amphibole; Chlorite; Oxides; Talc | |||||||||||||
| 357-M0069A-9R-1,0 | 1 | 13.040 | Rubble | Dolerite rubble | Rubble dominated by metadolerite. No distinct signs of alteration are visible. | 95 | ||||||||||||||
| 357-M0069A-9R-1,8 | 2 | 13.120 | Sediment | Polymict breccia | Roughly to mostly consolidated clastic material that is dominated by chlorite-schist. The interval 18-25cm appears to be a fault gouge (fine powder matrix, moderately consolidated) with the solid rock beneath it capped by intense cataclasites. | 90 | Minerals: Amphibole; Chlorite; Oxides; Talc | |||||||||||||
| 357-M0069A-9R-1,25 | 3 | 13.290 | Metamorphic/Fault Rock | Serpentinized harzburgite | Moderately oxidized serpentinized harzburgite with thin carbonate veins crosscutting the serpentine mesh texture and bastites. The carbonate veins possibly comprise sulfide minerals. | 100 | 2.5YR 2.5/3 | Structures: Veins=3 -- 5-10 per 10cm | Minerals: Carbonate; Magnetite; Oxides; Serpentine | Total alteration | ||||||||||
| 357-M0069A-9R-2,0 | 1 | 13.370 | Metamorphic/Fault Rock | Serpentinized harzburgite | Moderately oxidized serpentinized harzburgite, continuing from Unit 3 of 69A-8R1. The bastites occasionally have a talc rim. Locally intense recrystallization of serpentine along purple-black corridors occurs. | The interval is crosscut by numerous serpentine and carbonate veins that range from uniform to composite. | 100 | 2.5YR 6/3 | Structures: Veins=4 -- 10-20 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Magnetite; Oxides; Serpentine; Talc | Total alteration | ||||||||
| 357-M0069A-9R-2,61 | 2 | 13.980 | Metamorphic/Fault Rock | Serpentinized dunite | Slightly oxidized serpentinized dunite (no bastites visible). Bands of magnetite (ribbon texture?) are very distinct in this interval, occasionally a mesh texture is also developed. | 100 | 10BG 2.5/1 | Structures: Veins=5 -- >20 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Connectivity=7 -- Ribbon; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Carbonate; Magnetite; Oxides; Serpentine | Total alteration | |||||||||
| 357-M0069A-9R-2,78 | 3 | 14.150 | Metamorphic/Fault Rock | Serpentinized harzburgite | Moderately oxidized serpentinized harzburgite with occasional carbonate veins. The carbonate veins are typically composite with stronger oxidation in the center of the vein. | 100 | 2.5YR 2.5/1 | Structures: Veins=2 -- 1 - 5 per 10cm | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=3 -- Composite | Minerals: Carbonate; Hydroxides; Magnetite; Oxides; Serpentine | Total alteration | |||||||||
| 357-M0069A-9R-2,98 | 4 | 14.350 | Metamorphic/Fault Rock | Serpentinized dunite | Slightly oxidized serpentinized dunite (no bastites visible). Bands of magnetite (ribbon texture?) are very distinct in this interval, occasionally a mesh texture is also developed. Oxidation is mostly locallized along a few veins/fractures. | MBIO at 107cm - Checked - difficult to distinguish lithology from offshore image. | 100 | Structures: Veins=5 -- >20 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Carbonate; Hydroxides; Oxides; Serpentine | ||||||||||
| 357-M0069A-10R-1,0 | 1 | 14.720 | Rubble | Serpentinite rubble | Serpentinized harzburgite and serpentinized dunite rubble of reddish to dark red and pale green color. | 100 | Very high alteration | |||||||||||||
| 357-M0069A-10R-1,10 | 2 | 14.820 | Metamorphic/Fault Rock | Serpentinized harzburgite | Slightly oxidized serpentinized harzburgite with bastites. Various generations of mostly carbonate veins that range from uniform to composite. A few carbonate veins are slightly oxidized in the center of the veins as reflected by their orange color. | Serpentine veins are most likely also present. Thin section at 80-87cm is fully serpentinized harzburgite | 100 | 2.5YR 2.5/1 | Structures: Veins=5 -- >20 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Chromite; Oxides; Serpentine | Total alteration | ||||||||
| 357-M0069A-10R-1,99 | 3 | 15.710 | Metamorphic/Fault Rock | Serpentinized harzburgite | Serpentinized pyroxene-rich harzburgite (coarser than above), which is cut by a carbonate vein. MBIO at 103.5 - Checked - likely same material as above. | 100 | 2.5YR 2.5/1 | Structures: Veins=2 -- 1 - 5 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=3 -- Branched; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Carbonate; Magnetite; Oxides; Serpentine | Total alteration | |||||||||
| 357-M0069A-10R-2,0 | 1 | 15.940 | Metamorphic/Fault Rock | Serpentinized harzburgite | Pyroxene-rich serpeninized harzburgite that is moderately oxidized and is cut by a carbonate vein. This section is a continuation of the unit above (69A-10R1). Gradiation in grainzise and abundance of relict pyroxenes downwards - towards smaller grains, | less pyroxene.Vein intensity also increases downwards. Lower section: Various carbonate veins that range from uniform to composite crosscut the serpentinite mesh to ribbon texture. Semi-quant XRD: 20-21cm - carb (71), ant (15), chl (6), pl (1) | 100 | 2.5YR 2.5/1 | Structures: Veins=3 -- 5-10 per 10cm; Veins=4 -- 10-20 per 10cm | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=4 -- Network; Texture=1 -- Massive; Structure=2 -- Banded; Structure=3 -- Composite | Minerals: Bastite; Carbonate; Chromite; Magnetite; Oxides; Serpentine | Total alteration | ||||||||
| 357-M0069A-10R-2,24 | 2 | 16.180 | Metamorphic/Fault Rock | Serpentinized dunite | Entirely serpentinized and slightly oxidised dunite that contains a 1cm wide leucocratic magmatic vein with late serpentine and/or carbonate veins along the edge. The mesh texture is cut by several generations of carbonate veins. | 100 | Structures: Veins=4 -- 10-20 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Minerals: Carbonate; Magnetite; Oxides; Serpentine | |||||||||||
| 357-M0069A-10R-3,0 | 1 | 16.290 | Metamorphic/Fault Rock | Serpentinized dunite | Serpentinized dunite that is unlike the sections above almost not oxidized. No bastite are observed. Patches of disSeminated chromites with rims of white minerals, which are most likely carbonates. The groundmass is cut by several generations | of carbonate veins that are typically uniform. Core probably rotated and direct continuation of unit above (69A-10R2 Unit 2). Thin section at 0-2.5cm is fully serpentinized dunite. | 100 | 10GY 2.5/1 | Structures: Veins=3 -- 5-10 per 10cm | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Carbonate; Magnetite; Oxides; Serpentine | Total alteration |