Expedition 357 Scientists (2017): Description of lithologic section units of IODP Hole 357-M0071A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.872033
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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: 30.128450 * Longitude: -42.153300
Date/Time Start: 2015-11-09T00:00:00 * Date/Time End: 2015-11-10T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 3.580 m
Event(s):
357-M0071A (AM-04A) * Latitude: 30.128450 * Longitude: -42.153300 * Date/Time Start: 2015-11-09T00:00:00 * Date/Time End: 2015-11-10T00:00:00 * Elevation: -1390.8 m * IGSN: IBCR0357EHE0001 * Location: Atlantis Massif * Campaign: Exp357 * Basis: James Cook * Comment: MeBo, CTD: 30 7.702N / 42 9.208W
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 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture and foliation | |
| 12 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins | |
| 13 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture morphology | |
| 14 | Minerals | Minerals | Expedition 357 Scientists | Visual description |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
76 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 Structure (Fracture and foliation, Visua...) | 12 Structure (Veins, Visual description) | 13 Structure (Fracture morphology, Visual d...) | 14 Minerals (Visual description) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 357-M0071A-1R-1,0 | 1 | 0.000 | Metamorphic/Fault Rock | Serpentinized dunite | Serpentinized dunite. Chromium spinel trains (grains up to 3mm; train examples at 9cm, 19cm, 26cm) and numerous carbonate veins. The chromite trains have an apparent dip to 270-40 to 55. The cc veins have apparent dips of 90-5 to 55 (plus one 270-5). | The mesh texture is well developed. the serpentinization is probably complete. 0-5cm: Intrusion or vein of metagabbro. It is completely altered to chlorite rich assemblage. The veins are carbonate and possible carbonate + Fe-oxide. Some shows open space | filling. Metagabbro is very strongly fractured but not schistose. Thin section at 9-11.5cm is serpentinised dunite, with a area of abundant oxide grains probably after chrome-spinel. Localised oxidation is associated with patches of higher birefringent | ?serpentine. Carbonate veins show radiating textures. Semi-quant XRD: 9-11cm - liz (63), carb (19), cchrys (11), ox (7), 92-93cm - liz (93), mgt (4), ox (3) | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=4 -- 10-20 per 10cm; Foliation=0 -- Massive | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=4 -- Vuggy; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Carbonate; Chlorite; Hydroxides; Other; Serpentine; Spinel | |
| 357-M0071A-1R-2,0 | 1 | 0.580 | Metamorphic/Fault Rock | Serpentinized dunite | Serpentinized dunite transitioning to serpentinized harzburgite. 0-29cm: MBIO - Checked - Likely serpentinized dunite. 29-67cm: Serpentinized dunite with dissimated trains of spinels (to 2mm, trains dip to 270-45 or 50) and numerous carbonate veins | (as the previous unit). The serpentinization is complete, oxidation mainly concentrated close to the carbonate veins. Very strongly brecciated 1cm interval at the top of the unit (rough foliation dipping to 270-45) and it is cut by one of the cc vein | with an apparent dip of 270-45. 60-67cm: Toward to the base of the unit there is a gradual increase of the modal proportion of bastite-opx. Bastite appears transparent green in color without any remnant of cleavages. | It seemes to be replaced by serpentine serp + tc. See XRD of the next section. | Structures: Open fractures=1 -- <1 per 10cm; Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive; Foliation=1 -- Weakly foliated | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=8 -- Parallel; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Bastite; Carbonate; Hydroxides; Other; Serpentine | |
| 357-M0071A-1R-2,67 | 2 | 1.250 | Metamorphic/Fault Rock | Serpentinized harzburgite | The upper part of the unit is an in-situ breccia with angular fragments of harzburgites in a carbonate matrix. The upper contact is within the bastite-rich base of Unit 1. Serpentinization is complete. Opx-bastite are around 3mm, 20-30% modally. Same | observations about bastite as unit 1 (green transparent patches). The brecciated interval at the top of the unit is highly deformed. There is not foliation throughout the full the unit.The oxidation is pronounced down to 87cm. There are carbonate veins | at 79cm into serpentinites. Late serpentine veins between 111-125cm. 75-123cm: Below the breccia the unit is very rubbly (maybe drilling induced?). 97-102cm: Gabbroic interval comprising medium grained cpx-rich gb (to 5mm) with patchy domains of with | cpx-poor troctolite. Irregular contacts between the two. The upper part of this gb interval is made by an amphibole-chlorite rich domain. The contact between the gb and the harzburgite is fractured/not preserved (in the upper and lower part). | Semi-quant XRD: 120-121cm - liz (91), mgt (3), plag (3), ox (3). Thin section at 88-92cm is serpentinised harzburgite with bastites and various veins, some possibly composite serpentine/carbonate. | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive; Cataclastic deformation=1 -- Minor fracturing | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=4 -- Vuggy; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Bastite; Calcite; Chlorite; Hydroxides; Other; Serpentine |
| 357-M0071A-1R-3,0 | 1 | 1.820 | Metamorphic/Fault Rock | Serpentinized harzburgite | Serpentinized harzburgite. Same as 1R2 bottom. Bastite about 25-30% modally,mostly 6mm. Serpentinization is complete, mesh texture, halos around bastite. The texture is mostly ribbon. | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins; Foliation=0 -- Massive | Veins: Shape=0 -- No veins | Fractures: Morphology=No open fractures | Minerals: Bastite; Magnetite; Other; Serpentine | ||||
| 357-M0071A-2R-1,0 | 1 | 2.720 | Rubble | Serpentinite rubble | Serpentinized harzburgite rubble. Angular pieces of 1-6cm in size. Bastite about 20% modally, around 6mm in size. 100% serpentinized, halos around bastite, mesh texture. | Structures: Veins=3 -- 5-10 per 10cm; Foliation=0 -- Massive | Veins: Shape=3 --Irregular; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=4 -- Vuggy; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Minerals: Bastite; Magnetite; Other; Serpentine | |||||
| 357-M0071A-2R-1,47 | 2 | 3.190 | Metamorphic/Fault Rock | Metagabbro | Metagabbro. 47-62cm: Medium grained (cpx about 6mm) metagabbro, and poikilitic cpx to 10mm. Toward the bottom, there is a plagioclase rich layer that could be a late magmatic product. Alteration into secondary pl, chl, amph, clays. There are hairline | dark-green veins (chlorite). They have an apparent dip of 90-20. At 53cm there is a chl-filled fracture with the same apparent dip. The upper limit of the gabbro is a fractured with oxidation with a true dip of 270-45. 60-66cm: there are chl-veins | that are maybe sheared with an apparent dip of 270-65. 64-65cm: TS - Highly chloritized gabbro. 66-86cm: MBIO - Checked - Metagabbro with clear leucocratic domains (likely troctolitic). Thin section at 64-67cm is a strongly chloritised metagabbro. | Semi-quant XRD: 64-67cm - chl (95), clay (5) | Structures: Open fractures=1 -- <1 per 10cm; Veins=3 -- 5-10 per 10cm; Gabbro crystal-plastic deformation=0 -- Undeformed | Veins: Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Irregular | Minerals: Amphibole; Chlorite; Clay minerals; Clinopyroxene; Plagioclase | |
| 357-M0071A-2R-2,0 | 1 | 3.580 | Metamorphic/Fault Rock | Metagabbro | Metagabbro with variable lithology. Px rich domains (cpx to 12mm) look like the gabbroic intervals in 71A-1R1 (96-103cm). Irregular leucocratic domains that are may be later more-evolved melts. There are irregular patches 1-2cm, maybe made by | serpentinized olivine/peridotite. Alteration into chlorite amphibole and probably serpentine (and secondary pl). | Structures: Open fractures=0 -- No open fractures; Veins=2 -- 1 - 5 per 10cm; Gabbro crystal-plastic deformation=0 -- Undeformed | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Connectivity=8 -- Parallel; Texture=1 -- Massive; Texture=4 -- Vuggy; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Fractures: Morphology=No open fractures | Minerals: Amphibole; Chlorite; Clinopyroxene; Plagioclase; Serpentine |