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- W61313403 abstract "COCORP and industry seismic reflection profiles probing beneath the thin veneer of Paleozoic sedimentary rocks of the US mid-continent are mapping a complex, largely unknown three dimensional mosaic of major fault zones and sutures, a highly variable Moho, and extensive sequences of unexplored volcanic and/or sedimentary strata. Key features of the Precambrian suggested by COCORP and other deep profiling include: Pervasive, distributed reflectivity, often diffractive, dominating the middle and lower crust. Moho that is rarely reflective, usually evident as a downward transition of distributed crustal reflectivity into mantle transparency. Volcano-clastic filled graben of the late Proterozoic Keweenawan rift buried beneath Paleozoic strata in Kansas and Michigan. Extensive, subhorizontal Precambrian stratification in the upper crust beneath the east- central US and the Texas-Oklahoma border region, argued to be either an extensive volcano-clastic basin, a voluminous felsic volcanic outpouring or a major intrusive sill complex. Crustal penetrating, dipping reflection zones that mark known (Grenville front) or inferred (Cashocton zone, Trans-Hudson orogen) shear zones. Non-reflective ( ) basement beneath the Appalachian foreland suggesting transparent massifs'' that serve as collisional buttresses during terrane accretion. Deep structure is sometimes at odds with simple extrapolations of surface geology. Clearly deep seismic profiling has only begun tomore » reveal the buried craton in the US. It is time for an integrated program for the systematic exploration of this special scientific frontier.« less" @default.
- W61313403 created "2016-06-24" @default.
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- W61313403 date "1992-01-01" @default.
- W61313403 modified "2023-09-24" @default.
- W61313403 title "Structure of Precambrian crust in the U. S. from COCORP deep seismic profiling" @default.
- W61313403 hasPublicationYear "1992" @default.
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