Expedition 357 Scientists (2017): Description of lithologic section units of IODP Hole 357-M0068B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.872028
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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: 30.125150 * Longitude: -42.095770
Date/Time Start: 2015-11-23T00:00:00 * Date/Time End: 2015-11-25T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 3935.000 m
Event(s):
357-M0068B (AM-02A) * Latitude: 30.125150 * Longitude: -42.095770 * Date/Time Start: 2015-11-23T00:00:00 * Date/Time End: 2015-11-25T00:00:00 * Elevation: -1102.0 m * IGSN: IBCR0357EH01001 * Location: Atlantis Massif * Campaign: Exp357 * Basis: James Cook * Comment: RD2, unsure if downhole plug is inserted in borehole as drill caught top of plug as it lifted off the seafloor
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 | Core disturbance | Disturbance | Expedition 357 Scientists | Visual description | ||
| 12 | Percentage | Perc | % | Expedition 357 Scientists | Visual description | Main lithology |
| 13 | Comment | Comment | Expedition 357 Scientists | Visual description | ||
| 14 | Color code HLS-system | Color HLS | Expedition 357 Scientists | Munsell Color System (1994) | ||
| 15 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture and foliation | |
| 16 | Structure | Structure | Expedition 357 Scientists | Visual description | Veins | |
| 17 | Structure | Structure | Expedition 357 Scientists | Visual description | Fracture morphology | |
| 18 | Minerals | Minerals | Expedition 357 Scientists | Visual description | ||
| 19 | Texture | Texture | Expedition 357 Scientists | Visual description | ||
| 20 | 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 Disturbance (Visual description) | 12 Perc [%] (Main lithology, Visual descri...) | 13 Comment (Visual description) | 14 Color HLS (Munsell Color System (1994)) | 15 Structure (Fracture and foliation, Visua...) | 16 Structure (Veins, Visual description) | 17 Structure (Fracture morphology, Visual d...) | 18 Minerals (Visual description) | 19 Texture (Visual description) | 20 Alteration (Visual description) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 357-M0068B-1R-1,0 | 1 | 0.000 | Metamorphic/Fault Rock | Serpentinized harzburgite | Porphyroclastic, serpentinized harzburgite (from 0 to 20cm) with porphyroclasts consisting of altered orthopyroxenes (bastites 5mm), containing a set of sub-parallel veins. From 20 to 30cm there is a highly foliated interval made by multiple, | altered (to amphibole and talc) magmatic intrusions within serpentinite that have an apparent dip of 090/50. | Structures: Open fractures=0 -- No open fractures; Veins=4 -- 10-20 per 10cm; Foliation=0 -- Massive; Foliation=2 -- Moderately foliated | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=1 -- Isolated; Connectivity=2 -- Single; Texture=1 -- Massive; Texture=2 -- Cross fiber; Structure=1 -- Uniform; Structure=2 -- Banded; Structure=3 -- Composite | Minerals: Amphibole; Bastite; Chlorite; Magnetite; Other; Serpentine; Talc; Tremolite | ||||||||||
| 357-M0068B-1R-1,30 | 2 | 0.300 | Metamorphic/Fault Rock | Serpentinized harzburgite | Serpentinized harzburgite with mesh texture and bastites. Heterogeneous deformation including a sub-vertical, sheared deformation zone (with talc-chlorite) in addition to serpentine and talc veins, of which some are sheared. | There is no consistent apparent dip of the veins. Adjacent to the sheared zone there is a pocket of sedimentary breccia with polygenic clasts (interval 53-61cm). Oxidation at the contact with the metasomatic deformation zone. | Semi-quant XRD: 38-40cm - liz (42), chl-smec (25), clay (23), mgt (3), tlc (3), pl (3) | 10GY 2.5/1 | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=3 -- 5-10 per 10cm; Foliation=2 -- Moderately foliated | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=1 -- Isolated; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Planar; Morphology=Irregular | Minerals: Bastite; Carbonate; Chlorite; Hydroxides; Magnetite; Serpentine; Talc | Total alteration | ||||||
| 357-M0068B-1R-1,73 | 3 | 0.730 | Sediment | Breccia, clast supported | Carbonate breccia, polygenetic, angular clasts ranging in size from less than a fewmm to up to a fewcm in size. Clasts include basalts (including green-schist facies), talc-schists, and other unidentified lithologies. 60% green clasts, 20% black clasts, | 10% yellow clasts and 10% red clasts. Thin section at 79.5 to 83.5cm shows a very wide range of clasts including fault schists, serpentinite, metadolerite, and oxidised clasts with lath shaped opaque minerals surrounded by zeolites and in | some cases enclosing porosity. Semi-quant XRD: 79.5-81cm - tlc (48), chl (19), amph (13), cchrys (8), clay (7), carb (5) | Minerals: Amphibole; Carbonate; Other; Oxides; Serpentine; Talc | Slight alteration | ||||||||||
| 357-M0068B-1R-1,93 | 4 | 0.930 | Sediment | Breccia, clast supported | Breccia made by two large clasts (more than 20 and more than 10cm each) of tc-amph schist with ambiguos protolith. Irregular borders, some showing slickensides (vein material). The smallest talc-amph clast is sharply foliated (90 to 101cm). | The second clast (from 101 to 125cm) has heterogeneous texture including a pale-green breccia at the base of the clast. The matrix is carbonate and includes small angular clasts. Thin section at 118.5 to 121cm is a talc-altered metagabbro containing | zircon grains, altered to chlorite and amphibole before talc. Thin section at 134 to 139cm is a high-temperature altered layered gabbro with weak dynamic recrystallisation of clinopyroxene and plagioclase and brown hornblende. | Semi-quant XRD: 134-139cm - opx (53), tlc (24), amph (18), cpx (5), duplicate sample from same interval - opx (53), amph (34), tlc (18), zeo (3) | Structures: Open fractures=1 -- <1 per 10cm; Foliation=0 -- Massive; Foliation=2 -- Moderately foliated; Cataclastic deformation=0 -- Undeformed | Veins: Shape=1 -- Straight/planar; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Texture=4 -- Vuggy; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Irregular | Minerals: Amphibole; Carbonate; Chlorite; Other; Oxides; Talc; Tremolite; Zeolites | |||||||
| 357-M0068B-1R-1,125 | 5 | 1.250 | Metamorphic/Fault Rock | Metagabbro | Gabbro: cpx 35 %, pl 50%, brown amphibole less than 15%, oxides less than 1% from thin section. Px: original grain size 0.5-2.5cm in diameter, equant, subhedral grains. Pl: 0.5 to 4mm in size. | Structures: Open fractures=0 -- No open fractures; Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive; Cataclastic deformation=0 -- Undeformed; Gabbro crystal-plastic deformation=0 -- Undeformed; Magmatic foliation=0 -- Isotropic: no shape fabric | Veins: Shape=1 -- Straight/planar; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=2 -- Banded | Fractures: Morphology=No open fractures | Minerals: Amphibole; Clinopyroxene; Other; Plagioclase | ||||||||||
| 357-M0068B-1R-2,0 | 1 | 1.470 | Sediment | Polymict breccia | Unconsolidated breccia with angular fragments. Most of the fragments are serpentinized harzburgites. The larger fragment (up to 5cm) consists of serpentinized, porphyroclastic harzburgites with oxides, relict opx, and mesh texture. | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins; Foliation=0 -- Massive; Cataclastic deformation=0 -- Undeformed | Veins: Shape=0 -- No veins | Fractures: Morphology=No open fractures | Minerals: Hydroxides; Serpentine; Talc; Tremolite | ||||||||||
| 357-M0068B-2R-1,0 | 1 | 1.720 | Gabbroic Rock | Gabbronorite | Gabbro: cpx (10%), some plagioclase (less than 70%), both subhedral, subrounded, equant grains. Grain size variation in gb. Open fractures probably due to drilling. No apparent penetrative deformation (plastic, Semibrittle or others). | Late alteration to amphibole and chlorite. Thin section at 31 to 36.5 is a relatively fresh layered gabbronorite with alteratation mainly of orthopyroxene to amphibole. Semi-quant XRD: 36-36.5cm - pl (66), amph (18), chl (1), cpx (6) | 100 | In hand made core description unit 6 corresponds to unit 1 in the DIS | 2.5YR 2.5/1 | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=2 -- 1 - 5 per 10cm; Gabbro crystal-plastic deformation=0 -- Undeformed | Veins: Shape=1 -- Straight/planar; Shape=3 --Irregular; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Chlorite; Clinopyroxene; Plagioclase | Slight alteration | |||||
| 357-M0068B-2R-1,45 | 2 | 2.170 | Metamorphic/Fault Rock | Talc-amphibole-chlorite schist | Talc-amphibole-chlorite-schist, resulting from a pervasive and isotropic alteration of a previously serpentinitic rock. The alteration is pale green in color (dominated by talc) with darker chlorite-amphibole zones. Thin section at 50-55cm is a 100% | altered chrome-spinel bearing harzburgite. Talc overprints serpentine and comprises 60% of the rock. There is some tremolite and chlorite. Semi-quant XRD: 55-56cm - tlc (56), amph (37), chl (5), hydr (3) | 100 | 5G 6/2 | Structures: Open fractures=2 -- 1-5 per 10cm; Veins=3 -- 5-10 per 10cm; Foliation=1 -- Weakly foliated; Cataclastic deformation=2 -- Moderate fracturing | Veins: Shape=3 --Irregular; Connectivity=2 -- Single; Connectivity=3 -- Branched; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=2 -- Banded | Fractures: Morphology=Planar; Morphology=Irregular | Minerals: Amphibole; Chlorite; Hydroxides; Other; Talc | Total alteration | ||||||
| 357-M0068B-2R-1,76 | 3 | 2.480 | Metamorphic/Fault Rock | Serpentinized harzburgite | The unit is made of oxidized serpentinized harzburgite, with localized talc-chlorite-amphibole alteration (possibly linked to melt intrusions). Darker veins (270/30 at 84cm) are cut by pale green serpentine veins (090/15 at same depth). Thin section | at 78-85cm is a highly talc-altered harzburgite (with talc overprinting serpentine) with a gabbroic vein altered to amphibole, chlorite and talc. Semi-quant XRD: 83-85cm - tlc (47), amph (27), cchrys (12), chl (7), mgt (2) | 100 | Structures: Veins=2 -- 1 - 5 per 10cm; Foliation=0 -- Massive; Foliation=2 -- Moderately foliated | Minerals: Bastite; Chlorite; Hydroxides; Other; Serpentine; Talc; Tremolite | Total alteration | |||||||||
| 357-M0068B-2R-1,106 | 4 | 2.780 | Metamorphic/Fault Rock | Talc-amphibole schist | Localized shear zone consisting of amphibole, chlorite and talc as the unit 2. | 100 | 10GY 2.5/1 | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins; Foliation=2 -- Moderately foliated | Fractures: Morphology=No open fractures | Minerals: Amphibole; Chlorite; Other; Talc | Total alteration | ||||||||
| 357-M0068B-2R-1,108 | 5 | 2.800 | Rubble | Talc-amphibole schist rubble | Rubble of talc fels with possible metasomatized gabbroic intrusions. | 100 | Structures: Open fractures=0 -- No open fractures; Veins=0 -- No veins | Minerals: Amphibole; Other; Talc | |||||||||||
| 357-M0068B-3R-1,0 | 1 | 3295.000 | Sediment | Polymict breccia | Subrounded to angular fragments of multiple rock types up to 4cm in size. No matrix material other than occasional carbonate coating on some fragments. Clasts include: metagabbro, altered porphyroclastic, serpentinized harzburgites, and talc-amphibole | schist. One clast is a previous carbonate-cemented, polymict breccia with manganese-oxide coated clast inside. | highly | 100 | Minerals: Amphibole; Chlorite; Clinopyroxene; Oxides; Plagioclase; Talc | ||||||||||
| 357-M0068B-3R-1,25 | 2 | 3545.000 | Sediment | Polymict breccia, carbonate matrix | Carbonate-hosted, roughly consolidated breccia with angular to subrounded clasts (partially oxided), mainly serpentinized harzburgites and talc-amphibole-schist. Poorly sorted, clast supported, clast size: less than 1mm to 4cm. No foraminifera or | manganese crusts visible in hand specimen. | undisturbed | 100 | Minerals: Amphibole; Carbonate; Chlorite; Oxides; Serpentine; Talc | ||||||||||
| 357-M0068B-3R-2,0 | 1 | 3935.000 | Metamorphic/Fault Rock | Serpentinized peridotite | Porphyroclastic serpentinized harzburgite. Porphyroclasts are up to 5mm in size and rounded to subrounded. Fragments in the core are 2 - 3cm in size, up to 6cm. | highly | 100 | 10GY 2.5/1 | Minerals: Magnetite; Serpentine | Total alteration | |||||||||
| 357-M0068B-4R-1,0 | 1 | 4.000 | Metamorphic/Fault Rock | Serpentinized porphyroclastic harzburgite | Probable drilling rubble composed of serpentinized porphyroclastic harzburgite. Fragments are up to 6cm in size and include some clay/carbonate-lined edges. | highly | 100 | 10GY 2.5/1 | Minerals: Bastite; Other; Serpentine | Total alteration | |||||||||
| 357-M0068B-4R-1,17 | 2 | 4.170 | Metamorphic/Fault Rock | Serpentinized harzburgite | Partially serpentinized harburgites impregnated by thin gabbroic veins in a lit par lit fabric. This magmatic fabric dips at 70 degrees in this core, but note the presence of possible sedimentary breccia in lower cores, suggesting that this may be a | rotated block. Patchy alteration to talc and amph. A set of bright green serpentine veins is parallel to the main fabric with a set of crosscutting grey-green veins present. Thin section at 18-22cm is a relatively fresh harzburgite cut by thin gabbroic | veins, now altered to chlorite and amphibole. Note that the gabbro veins are not parallel to the prominent fabric of serpentine veins and alteration. Semi-quant XRD: 18-21cm - cchrys (40), cpx (20), ol(13), liz (9), chl (8), amph (3), mgt (3) | undisturbed | 60 | 10BG 3/1 | Structures: Veins=2 -- 1 - 5 per 10cm; Magmatic foliation=0 -- Isotropic: no shape fabric | Veins: Shape=1 -- Straight/planar; Shape=2 -- Sigmoidal/ curved; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Amphibole; Chlorite; Magnetite; Orthopyroxene; Serpentine; Talc; Olivine | Very high alteration | |||||
| 357-M0068B-4R-1,33 | 3 | 4.330 | Metamorphic/Fault Rock | Metagabbro | Similar to overlying unit except for thicker altered microgabbro units up to 3cm in thickness are interpreted to intrude peridotite leaving 1cm serpentinized layers with a similar dip to the overlying core. A composite light green to dark green | serpentine vein cuts the banding at the top of this section. Thin section at 50-53cm is a partially serpentinised harzburgite with possibly some gabbroic impregnations and thin shear zones of dynamically recrystallised olivine. | undisturbed | 70 | 10YR 4/2 | Structures: Veins=2 -- 1 - 5 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform | Minerals: Amphibole; Chlorite; Oxides; Serpentine; Talc | Very high alteration | ||||||
| 357-M0068B-4R-1,56 | 4 | 4.560 | Metamorphic/Fault Rock | Serpentinized dunite | Homogeneous serpentinite with no bastites visible, some thin stringers of gabbro are present parallel to those in higher units. Two sets of veins are subparallel to the fabric: 1) bright green serpentine veins locally with a dark brown to orange halo. | 2) white, fibrous, lense shaped serpentine veins. Between 93 and 100cm depth three generations of veins are present: The first are chalky white serpentine veins mainly parallel to the dip, the second are mainly parallel to the dip and the third are | reticulate carbonate veins. | undisturbed | 95 | 10GY 2.5/1 | Structures: Veins=3 -- 5-10 per 10cm | Veins: Shape=2 -- Sigmoidal/ curved | Minerals: Carbonate; Magnetite; Oxides; Serpentine | Total alteration | |||||
| 357-M0068B-4R-1,122 | 5 | 5.220 | Metamorphic/Fault Rock | Metagabbro | This unit has a moderately dipping, lobate contact with the overlying serpentinized dunite, which is subparallel to magmatic veins in the overlying unit. The piece contains strongly zoned and intense alteration. At the outer margin the gabbroic texture | is clear, but plagioclase is milky suggesting rodingitization. The next zone is dark green and appears to be composed of talc and amphibole, while an inner zone is largely talc. It is possible that the inner zone is fault breccia overprinted | by pervasive alteration. | undisturbed | 60 | Structures: Veins=2 -- 1 - 5 per 10cm; Cataclastic deformation=4 -- Well developed fault brecciation; clast rotation | Minerals: Amphibole; Chlorite; Oxides; Sulfides; Talc | Very high alteration | |||||||
| 357-M0068B-4R-2,0 | 1 | 5.390 | Sediment | Serpentinite-rich breccia, carbonate matrix | Rubble containing clasts of serpentinized porphyroclastic harzburgite and breccia with a carbonate-dominated matrix that is poorly sorted and contains angular to subrounded lithic fragments. | slightly | 100 | 10GY 2.5/1 | Structures: Veins=0 -- No veins | Minerals: Amphibole; Chlorite; Oxides; Serpentine; Talc | Total alteration | ||||||||
| 357-M0068B-5R-1,0 | 1 | 4.070 | Gabbroic Rock | Gabbro | Rubble consisting of porphyroclastic serpentinite and metagabbro. The metagabbro shows partial alteration to amphibole, talc, and chlorite. | rubble | 60 | 10GY 2.5/1 | Structures: Veins=0 -- No veins | Minerals: Amphibole; Chlorite; Clinopyroxene; Orthopyroxene; Oxides; Plagioclase; Serpentine; Talc | Coarse-grained | High alteration | |||||||
| 357-M0068B-6R-1,0 | 1 | 5.850 | Metamorphic/Fault Rock | Serpentinized harzburgite | Subrounded pebbles with red weathering crusts up to 1cm in thickness suggesting seafloor exposure. The clasts include serpentinized harzburgites, isotropic talc rock, talc-amphibole cataclasite, talc-amphibole schist and altered dolerite. | 70 | Minerals: Amphibole; Chlorite; Hydroxides; Oxides; Talc | Very high alteration | |||||||||||
| 357-M0068B-6R-1,19 | 2 | 6.040 | Metamorphic/Fault Rock | Talc-amphibole-chlorite schist | Angular fragments of talc-amphibole-chlorite schist with a range of internal textures. One clast contains an undeformed, igneous material interpreted as a dike margin cutting across talc-amphibole schistosity. Most fragments are intensely deformed. | 90 | 10BG 7/1 | Minerals: Amphibole; Chlorite; Oxides; Talc | Total alteration | ||||||||||
| 357-M0068B-6R-1,37 | 3 | 6.220 | Metamorphic/Fault Rock | Serpentinized peridotite | Subrounded clasts of oxidized serpentinites and gabbroic rubble. Some clasts contain cataclastic fragments. Hematite-rich rims are similar to those in the first section of this core. | 60 | 10GY 2.5/1 | Minerals: Amphibole; Chlorite; Oxides; Talc | Total alteration | ||||||||||
| 357-M0068B-7R-1,0 | 1 | 7.570 | Rubble | Mixed rubble | Mixed rubble probably from higher in the hole with several pieces of fault rocks derived from ultramafic fault rocks, breccias, schistose fabrics, metagabbro and dolerite. Some red oxidation occurs on some fragments. The sample collected for | microbiology between 16 and 29cm appears to be a continuation of this unit. | 55 | Minerals: Amphibole; Chlorite; Hydroxides; Orthopyroxene; Oxides; Plagioclase; Serpentine; Talc | Total alteration | ||||||||||
| 357-M0068B-7R-1,29 | 2 | 7.860 | Metamorphic/Fault Rock | Metabasalt | Several pieces of meta-basalts including drilled pieces, probably metamorphosed and also variably weathered. Small clinopyroxene porphyroclasts are visible and are aligned in a magmatic fabric. | 100 | 10YR 4/1 | Minerals: Clinopyroxene; Orthopyroxene; Plagioclase | Sparsley phyric | Slight alteration | |||||||||
| 357-M0068B-8R-1,0 | 1 | 8.730 | Rubble | Mixed rubble | Rubble consisting of subrounded to angular pieces of talc- and talc-amphibole schists (up to 11cm) and basalts (up to 6cm). Talc schists are very fine-grained, highly foliated; presence of bastites that are completely metasomatized. Soapy to the touch. | Talc-amphibole schists are highly foliated, with sigmoidal texture and the matrix is rich in talc. We observed angular darker clasts (< 1mm) within a talc-tremolite schistose matrix, that most probably are amphibole. Basalts vary from an aphyric texture | (pieces at the bottom of the core) to fragments (from 5 to 8cm) with rare amphibole microliths (< 2mm). Low intensity brittle deformation, with hairline fractures and no apparent deformation associated with them, nor penetrative. Thin section of a clast | at 15-20cm is a consolidated fault breccia composed of clasts of foliated fault schist, enclosed in a cataclastic matrix rich in chlorite. Clasts include crystal plastic fabrics in tremolite. Semi-quant XRD: 15-20cm - amph (67), tlc (18), clay (15), | duplicate sample from same interval - amph (66), tlc (24), clay (9) | 100 | Structures: Open fractures=1 -- <1 per 10cm; Foliation=1 -- Weakly foliated; Foliation=3 -- Strongly foliated; Cataclastic deformation=1 -- Minor fracturing | Veins: Shape=1 -- Straight/planar; Connectivity=2 -- Single; Texture=1 -- Massive; Structure=1 -- Uniform; Structure=3 -- Composite | Fractures: Morphology=Irregular | Minerals: Amphibole; Bastite; Other; Oxides; Serpentine; Talc; Tremolite |