Burial history of Lockport formation (Middle Silurian), New York, in light of studies of Ellenburger group (Lower Ordovician), west Texas-southeastern New Mexico
For studies of burial depth of the Lockport Formation (Middle Silurian) of the Appalachian basin, the authors used as a control data from petrographic, stable isotope, and two-phase fluid-inclusion analyses of carbonate rocks cored from 5000 to 23,000 ft (1.5 to 7 km) burial depth of the Ellenburger Group, west Texas and southeastern New Mexico. The coarse to very coarse crystalline nature of the host-rock dolomite, the vug-filling and fracture-filling saddle dolomite containing relatively light oxygen isotope compositions ranging from -6 to -12 per thousand (PDB), and the high mean homogenization temperatures for saddle dolomite formation from 100/sup 0/ to 260/sup 0/C, all suggest diagenetic changes occurred under deep burial conditions. Using Ellenburger carbonates as a control for burial depth diagenesis studies of saddle dolomite of the surface-exposed Lockport Formation, New York, other literature, and the regional conodont color alteration index (CAI) of 2-3, a former burial depth for the Lockport Formation strata of up to 5 km is indicated, much greater than the present estimation of less than 2 km of paleogeographic reconstruction. This depth was confirmed by delta/sup 18/O values ranging from -9 to -11 per thousand, and two-phase fluid-inclusion homogenization temperatures ranging from 110/sup 0/ to 200/sup 0/C with an average of 150/sup 0/C.
- Research Organization:
- Brooklyn College of the City Univ. of New York
- OSTI ID:
- 5064351
- Report Number(s):
- CONF-860624-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 70:5; Conference: American Association of Petroleum Geologists annual meeting, Atlanta, GA, USA, 15 Jun 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEW MEXICO
RESERVOIR ROCK
NEW YORK
DIAGENESIS
TEXAS
DOLOMITE
GEOLOGIC FORMATIONS
MATURATION
ORDOVICIAN PERIOD
SILURIAN PERIOD
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
FEDERAL REGION II
FEDERAL REGION VI
GEOLOGIC AGES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
USA
020200* - Petroleum- Reserves
Geology
& Exploration