Abstract
To understand the relation between fluid seeps and structures, sedimentary rocks were collected with the DSRV Alvin from a vertical fault zone that transects the deformation front of the Cascadia accretionary wedge. The rocks contained diagenetic carbonate cement that was precipitated from fluids expelled during accretion. Carbon, oxygen, and strontium isotope data are consistent with a fluid source at >2 km depth. Most carbon isotopes range from -1‰ to -25‰ (PDB standard) consistent with a thermogenic methane source. Oxygen isotopes show extreme 18O depletions that are consistent with precipitation from fluids with temperatures as high as 100°C. 87Sr/86Sr values of 0.709 75 to 0.712 79 may be due to strontium in fluids derived from clay-rich parts of the stratigraphic section. The ubiquity of carbonate precipitates and the isotope data indicate that the vertical fault zone is an efficient conduit for fluid dewatering from deep levels of the accretionary wedge. -Authors
| Original language | English (US) |
|---|---|
| Pages (from-to) | 507-510 |
| Number of pages | 4 |
| Journal | Geology |
| Volume | 21 |
| Issue number | 6 |
| DOIs | |
| State | Published - 1993 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Geology
Cite this
Carbonate cements indicate channeled fluid flow along a zone of vertical faults at the deformation front of the Cascadia accretionary wedge (northwest U.S. coast). / Sample, James C; Reid, Mary; Tobin, H. J.; Moore, J. C.
In: Geology, Vol. 21, No. 6, 1993, p. 507-510.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Carbonate cements indicate channeled fluid flow along a zone of vertical faults at the deformation front of the Cascadia accretionary wedge (northwest U.S. coast)
AU - Sample, James C
AU - Reid, Mary
AU - Tobin, H. J.
AU - Moore, J. C.
PY - 1993
Y1 - 1993
N2 - To understand the relation between fluid seeps and structures, sedimentary rocks were collected with the DSRV Alvin from a vertical fault zone that transects the deformation front of the Cascadia accretionary wedge. The rocks contained diagenetic carbonate cement that was precipitated from fluids expelled during accretion. Carbon, oxygen, and strontium isotope data are consistent with a fluid source at >2 km depth. Most carbon isotopes range from -1‰ to -25‰ (PDB standard) consistent with a thermogenic methane source. Oxygen isotopes show extreme 18O depletions that are consistent with precipitation from fluids with temperatures as high as 100°C. 87Sr/86Sr values of 0.709 75 to 0.712 79 may be due to strontium in fluids derived from clay-rich parts of the stratigraphic section. The ubiquity of carbonate precipitates and the isotope data indicate that the vertical fault zone is an efficient conduit for fluid dewatering from deep levels of the accretionary wedge. -Authors
AB - To understand the relation between fluid seeps and structures, sedimentary rocks were collected with the DSRV Alvin from a vertical fault zone that transects the deformation front of the Cascadia accretionary wedge. The rocks contained diagenetic carbonate cement that was precipitated from fluids expelled during accretion. Carbon, oxygen, and strontium isotope data are consistent with a fluid source at >2 km depth. Most carbon isotopes range from -1‰ to -25‰ (PDB standard) consistent with a thermogenic methane source. Oxygen isotopes show extreme 18O depletions that are consistent with precipitation from fluids with temperatures as high as 100°C. 87Sr/86Sr values of 0.709 75 to 0.712 79 may be due to strontium in fluids derived from clay-rich parts of the stratigraphic section. The ubiquity of carbonate precipitates and the isotope data indicate that the vertical fault zone is an efficient conduit for fluid dewatering from deep levels of the accretionary wedge. -Authors
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U2 - 10.1130/0091-7613(1993)021<0507:CCICFF>2.3.CO;2
DO - 10.1130/0091-7613(1993)021<0507:CCICFF>2.3.CO;2
M3 - Article
VL - 21
SP - 507
EP - 510
JO - Geology
JF - Geology
SN - 0091-7613
IS - 6
ER -