Expedition 357 Scientists (2017): Description of lithologic section units of IODP Hole 357-M0071C [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.872035
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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: 30.128330 * Longitude: -42.153430
Date/Time Start: 2015-11-25T00:00:00 * Date/Time End: 2015-11-28T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 11.690 m
Event(s):
357-M0071C (AM-04A) * Latitude: 30.128330 * Longitude: -42.153430 * Date/Time Start: 2015-11-25T00:00:00 * Date/Time End: 2015-11-28T00:00:00 * Elevation: -1390.0 m * IGSN: IBCR0357EH11001 * Location: Atlantis Massif * Campaign: Exp357 * Basis: James Cook * Comment: MeBo
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 | Core disturbance | Disturbance | Expedition 357 Scientists | Visual description | ||
| 10 | Percentage | Perc | % | Expedition 357 Scientists | Visual description | Main lithology |
| 11 | Comment | Comment | Expedition 357 Scientists | Visual description | ||
| 12 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture and foliation | |
| 13 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins | |
| 14 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture morphology | |
| 15 | Minerals | Minerals | Expedition 357 Scientists | Visual description |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
163 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 Disturbance (Visual description) | 10 Perc [%] (Main lithology, Visual descri...) | 11 Comment (Visual description) | 12 Structure (Fracture and foliation, Visua...) | 13 Structure (Veins, Visual description) | 14 Structure (Fracture morphology, Visual d...) | 15 Minerals (Visual description) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 357-M0071C-1R-1,0 | 1 | 0.000 | Rubble | Serpentinite rubble | Rubble of serpentinized harzburgites and metagabbro. Pieces <3cm, except for two larger fragments (at 45-65cm) 12-17cm: Fragment is a mix of serpentinized harzburgite and metagabbro. 21-25cm: Fragment of strongly altered metagabbro with yellow clay | alteration. The rest of the fragments are serp harzburgites with small debris of fiber serp veins (65-67cm); 10-20% modal bastite (about 6mm in size). The piece at 6-10cm is oxidised by dark red mesh. There may be fresh opx relics at 47cm. There are | thin white serp veins sub-parallel to the mesh ribbon texture between 45 and 55cm. Serpentinized harzburgite maybe underwent late metasomatic alteration (mainly around opx bastite). | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins; Foliation=0 -- Massive | Veins: Shape=0 -- No veins | Minerals: Bastite; Magnetite; Other; Serpentine; Talc | ||||
| 357-M0071C-1R-1,46 | 2 | 0.460 | Metamorphic/Fault Rock | Serpentinized harzburgite | Two larger, mostly intact pieces of core (>10cm) of serpentinized harzburgite | |||||||||
| 357-M0071C-1R-2,0 | 1 | 0.680 | Rubble | Serpentinite rubble | Rubble of serpentinized harzburgite same as 71C-1R1. This interval is very similar to the interval of 45-65 of 1R1. 100% serp, thin anostomosing white serp veins subparallel to the ribbon mesh texture. | 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-M0071C-2R-1,0 | 1 | 2.680 | Rubble | Serpentinite rubble | Angular to subrounded fragments of serpentinised harzburgite to 5cm in size. Two large pieces betwee 36-47cm. No matrix. Semi-quant XRD: 74-76cm - liz (31), clay (27), clinochrysotile (22), chl (16), mgt (4) | 100 | Structures: Peridotite crystal-plastic deformation=1 -- Porphyroclastic weakly foliated | Minerals: Serpentine | ||||||
| 357-M0071C-2R-1,50 | 2 | 3.180 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Serpentinized harzburgite with weak porphyroclastic fabric dipping at 20 degrees towards 090 in the core reference frame. Serpentinization is complete as shown by a thin section at 75cm. Two sets of veins are present, with a network of steeply dipping | white-green serpentine veins cut by thin, discontinuous sub-horizontal serpentine veins. 79-96cm: MBIO - Checked - Appears to be similar, with some oxidation. Thin section at 71-76cm is a 100% serpentinized harzburgite. | 100 | Add XRD, TS data | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=3 -- 5-10 per 10cm; Cataclastic deformation=1 -- Minor fracturing; Peridotite crystal-plastic deformation=1 -- Porphyroclastic weakly foliated | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Fractures: Morphology=Planar | Minerals: Magnetite; Serpentine | ||
| 357-M0071C-2R-2,0 | 1 | 3.650 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Serpentinized harzburgite with a moderately porphyoclastic fabric dipping at 60 degrees in the core refrence frame. Oxidized serpentine mesh texture with elongate bastites up to 5mm in size. Steep serpentine veins are cut by shallow serpentine veins. | Same as unit above. | 100 | Structures: Veins=2 -- 1 - 5 per 10cm; Peridotite crystal-plastic deformation=2 -- Porphyroclastic strongly foliated | Veins: Shape=3 --Irregular; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Magnetite; Serpentine | ||||
| 357-M0071C-3R-1,0 | 1 | 5.020 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Angular to rounded fragments of serpentinised harzburgite up to 4cm in size. Some fragments partly oxidised. Bastites to 10mm, averaging 6mm. Approx 25% bastite modally. 0-10cm: MBIO - Checked - Likely serpentinized harzburgite. | rubble | ||||||||
| 357-M0071C-3R-1,41 | 2 | 5.430 | Rubble | Serpentinite rubble | Sub-angular to sub-rounded rubble of serpentinised harzburgite with very weak porphyoclastic fabric. Sepentine or carbonate veins dip at 55 degrees towards 090 in the core reference frame. | 100 | Structures: Peridotite crystal-plastic deformation=1 -- Porphyroclastic weakly foliated | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=8 -- Parallel; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Magnetite; Serpentine | |||||
| 357-M0071C-4R-1,0 | 1 | 6.930 | Rubble | Mixed rubble | Angular to sub-angular rubble of metagabbro and serpentinized harzburgite to 4cm in size. One piece contains a contact between metagabbro and serpentinite cut by a vein. | 60 | ||||||||
| 357-M0071C-5R-1,0 | 1 | 7.380 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Fragments of serpentinised harzburgite. Bastites after orthopyroxene up to 4mm. | 100 | Minerals: Magnetite; Serpentine | |||||||
| 357-M0071C-5R-1,8 | 2 | 7.460 | Metamorphic/Fault Rock | Metagabbro | Gabbroic piece contains a vein of coarser gabbro. Highly altered to chlorite and amphibole. | 100 | Minerals: Amphibole; Chlorite; Clinopyroxene | |||||||
| 357-M0071C-5R-1,16 | 3 | 7.540 | Metamorphic/Fault Rock | Serpentinized harzburgite | Drilled piece of serpentinised harzburgite. | 100 | Minerals: Magnetite; Serpentine | |||||||
| 357-M0071C-5R-1,24 | 4 | 7.620 | Rubble | Serpentinite rubble | Subrounded to rounded rubble of serpentinised harzburgite. | 100 | Minerals: Magnetite; Serpentine | |||||||
| 357-M0071C-5R-1,30 | 5 | 7.680 | Metamorphic/Fault Rock | Rodingitized gabbro | Drilled piece contains steep contact between gabbroic and ultramafic rock. Gabbro is layered and highly altered to rodingite. Signs of earlier corona textures suggesting troctolitic layers. Subhorizontal chlorite veins cut the layering. | 90 | Veins: Shape=1 -- Straight/planar; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Chlorite; Hydrogarnet; Prehnite | ||||||
| 357-M0071C-5R-2,0 | 1 | 7.790 | Metamorphic/Fault Rock | Serpentinized harzburgite | All to MBIO. 0-END: MBIO - Checked - Likely serpentinized harzburgite. | Minerals: Bastite; Magnetite; Serpentine | ||||||||
| 357-M0071C-6R-1,0 | 1 | 9.630 | Metamorphic/Fault Rock | Metadolerite | Fine to medium grained metadolerite (confirmed by thin section at 55cm). Plagioclase laths often still visible, clinopyroxene replaced by amphibole, with abundant chlorite in the XRD sample (possibly in a vein halo). Approximately 3% subhedral | plagioclase phenocrysts, up to 5mm in size, and approximately 1% clinopyroxene phenocrysts up to 4mm in size. 19-20cm: A 1cm shear zone occupied by talc-amphibole schist, which may be an inclusion in the dyke or possibly a sheared dyke margin - a bulbous | area of finegrained dolerite probably reresenting a chilled margin is seen just below this zone. Otherwise there is little deformation within this interval. 58-74cm: MBIO - Checked - Likely metadolerite. | 100 | Add XRD data | Structures: Open fractures=1 -- <1 per 10cm; Veins=0 -- No veins; Foliation=0 -- Massive; Cataclastic deformation=1 -- Minor fracturing | Veins: Shape=0 -- No veins | Minerals: Amphibole; Chlorite; Plagioclase | ||
| 357-M0071C-6R-1,46 | 2 | 10.090 | Rubble | Dolerite rubble | Angular fragments of metadolerite with sharp subhorizontal fault contact marking the base of the overlying piece. Thin section at 55-57cm is undeformed metadolerite with pyroxene replaced by amphibole. | Semi-quant XRD: 55-57cm - chl (54), amph (22), pl (21) | 100 | Structures: Veins=0 -- No veins | Veins: Shape=0 -- No veins | Minerals: Amphibole; Chlorite; Plagioclase | ||||
| 357-M0071C-7R-1,0 | 1 | 11.690 | Metamorphic/Fault Rock | Serpentinized harzburgite | A fragment (6cm) of serpentinized harzburgite with bastites up to 8mm. Small white veins probably serpentine. | Structures: Veins=2 -- 1 - 5 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=8 -- Parallel; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Magnetite; Serpentine | ||||||
| 357-M0071C-9R-1,0 | 1 | 9.670 | Rubble | Serpentinite rubble | Serpentinized harzburgite rubble with some metagabbro clasts. 0-14cm: MBIO - Checked - Mixed subangular to subrounded rubble of likely serpentinized harz, metadolerite? | 80 | Minerals: Magnetite; Serpentine | |||||||
| 357-M0071C-9R-1,47 | 2 | 10.140 | Metamorphic/Fault Rock | Metadolerite | Metadolerite with patchy greenish alteration and more intense ?epidote alteration at the bottom. Steep brown haloed veins containing oxides are cut by shallow fault veins with small offsets, associated with unknown yellow grains. | 100 | Structures: Veins=2 -- 1 - 5 per 10cm; Cataclastic deformation=1 -- Minor fracturing | Veins: Shape=1 -- Straight/planar; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=4 -- Haloed | Minerals: Amphibole; Chlorite; Plagioclase |