Pisciotto, Kenneth A (1980): (Table 1) Lithology, mineralogy, and physical properties of Cretaceous cherts and porcellanites at DSDP Hole 56-436 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.822298, Supplement to: Pisciotto, KA (1980): Chert and porcellanite from Deep Sea Drilling Project Site 436, Northwest Pacific. In: Scientific Party, Initial Reports of the Deep Sea Drilling Project, 56/57 (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 56-57, 1133-1142, https://doi.org/10.2973/dsdp.proc.5657.147.1980
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Abstract:
Cretaceous chert and porcellanite recovered at Site 436, east of northern Honshu, Japan, are texturally and mineralogically similar to siliceous rocks of comparable age at Sites 303, 304, and 307 in the northwest Pacific. These rocks probably were formed by impregnation of the associated pelagic clay with locally derived silica from biogenic and perhaps some volcanic debris. Fine horizontal laminations are the only primary sedimentary structures, suggesting minimal reworking and transport. Collapse breccias and incipient chert nodules are diagenetic features related to silicification and compaction of the original sediment.
Disordered opal-CT (d[101] = 4.09 Å) and microgranular quartz (crystallinity index < 1.0) are the two common silica minerals present. Some samples show quartz replacing this poorly ordered opal- CT, supporting the notion that opal-CT does not become completely ordered (i.e., d[101] = 4.04 Å) in some cases before being converted to quartz. The present temperature calculated for the depth of the shallowest chert and porcellanite at this site is 30 °C; this may represent the temperature of conversion of opal-CT to quartz. High reflection coefficients (0.29-0.65) calculated for the boundary between chert-porcellanite and clay-claystone support the common observation that chert is a strong seismic reflector in deep-sea sedimentary sections.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 39.932700 * Longitude: 145.557800
Date/Time Start: 1977-10-01T00:00:00 * Date/Time End: 1977-10-01T00:00:00
Minimum DEPTH, sediment/rock: 378.9 m * Maximum DEPTH, sediment/rock: 388.3 m
Event(s):
56-436 * Latitude: 39.932700 * Longitude: 145.557800 * Date/Time: 1977-10-01T00:00:00 * Elevation: -5240.0 m * Penetration: 397.5 m * Recovery: 240.8 m * Location: North Pacific/RIDGE * Campaign: Leg56 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 397.5 m cored; 0 m drilled; 60.6 % recovery
Comment:
Sediment depth is given in mbsf. Empty cells mean no data.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Pisciotto, Kenneth A | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Lithology/composition/facies | Lithology | Pisciotto, Kenneth A | |||
| 4 | Opal-CT | Opal-CT | % | Pisciotto, Kenneth A | X-ray diffraction (XRD) | <1 = trace |
| 5 | Quartz | Qz | % | Pisciotto, Kenneth A | X-ray diffraction (XRD) | #1 = present |
| 6 | d-spacing | d | Å | Pisciotto, Kenneth A | see reference(s) | d(101) Opal-CT |
| 7 | Crystallinity | Cryst | Pisciotto, Kenneth A | Quartz | ||
| 8 | Density, dry bulk | DBD | g/cm3 | Pisciotto, Kenneth A | Pycnometer | |
| 9 | Density, grain | Density grain | g/cm3 | Pisciotto, Kenneth A | Pycnometer | Assumed |
| 10 | Porosity | Poros | % vol | Pisciotto, Kenneth A | Calculated, see reference(s) | |
| 11 | Density | Density | g/cm3 | Pisciotto, Kenneth A | Pycnometer | Saturated bulk |
| 12 | Velocity, compressional wave | Vp | m/s | Pisciotto, Kenneth A | ||
| 13 | Impedance, specific | Impedance | kg/cm2/s | Pisciotto, Kenneth A | see reference(s) | Acoustic |
| 14 | Sediment type | Sediment | Pisciotto, Kenneth A |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
86 data points
Data
| 1 Sample label | 2 Depth sed [m] | 3 Lithology | 4 Opal-CT [%] | 5 Qz [%] | 6 d [Å] | 7 Cryst | 8 DBD [g/cm3] | 9 Density grain [g/cm3] | 10 Poros [% vol] | 11 Density [g/cm3] | 12 Vp [m/s] | 13 Impedance [kg/cm2/s] | 14 Sediment |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 56-436-41-1,35-37 | 378.9 | Breccia ted yellow chert | #1 | <1 | 2.49 | 2.60 | <4 | 2.53 | Yellow and brown zeolitic clay | ||||
| 56-436-41-1,40-42 | 378.9 | Pale brownish-white porcellanite | #1 | <1 | 1.65 | 2.60 | 37 | 2.29 | Yellow and brown zeolitic clay | ||||
| 56-436-41-1,42-44 | 378.9 | Brecciated yellow chert | #1 | 1.1 | 2.50 | 2.60 | <4 | 2.54 | 4100 | 10500 | Yellow and brown zeolitic clay | ||
| 56-436-41-1,44-45 | 379.0 | Brown laminated porcellanite | 86 | 14 | 4.093 | 1.69 | 2.29 | 26 | 1.95 | 2500 | 4900 | Yellow and brown zeolitic clay | |
| 56-436-42-1,7-10 | 388.1 | Brown laminated chert | <1 | #1 | <1 | 2.43 | 2.58 | 6 | 2.49 | 3100 | 7700 | Brown Fe- and Mn-clays | |
| 56-436-42-1a,14-17 | 388.2 | Red, orange, and brown chert | 60 | 40 | 4.091 | <1 | 2.27 | 2.38 | 5 | 2.32 | Brown Fe- and Mn-clays | ||
| 56-436-42-1b,14-17 | 388.2 | Brown porcellanite | 78 | 22 | 4.096 | 1.57 | 2.32 | 32 | 1.89 | Brown Fe- and Mn-clays | |||
| 56-436-42-1,25-30 | 388.3 | Brown laminated porcellanite with chert nodule | 74 | 26 | 4.092 | 1.69 | 2.33 | 27 | 1.96 | 4900 | 9500 | Brown Fe- and Mn-clays |