TY - JOUR

T1 - Chemical logging of continental-marine depositional systems. A tool to unravel the palaeogeography and diagenetic alteration of fine-grained clastic rocks in a transitional environment of deposition (Triassic-Liassic, Southeastern Germany)

AU - Dill, H. G.

AU - Wehner, H.

AU - Botz, R.

AU - Dultz, S.

N1 - Funding information: We thank Dr. Dave Goodenough, Dr. Martin Bergeron, and Mr. Andrew Dyk for useful inputs during the process of atmospheric corrections of the CHRIS data. We also thank Dr. Jose Moreno from University of Valencia and Dr. Luis Guanter and Luis Gomez for processing the data with the BEAM software. Peter Fletcher put some great effort in coordinating the CHRIS acquisitions, and Dr. Tom Noland, Jan Pisek, and Emil Zelic were of great help in accomplishing the fieldwork. Dr. John Miller and Jim Freemantle provided us with some field instruments and in-depth instruction on their use. We thank the European Space Agency (ESA) for the CHRIS data and the Canadian Space Agency (CSA) for funding to conduct this research.

PY - 2000/5

Y1 - 2000/5

N2 - From the Late Triassic through the Early Liassic, at the northern edge of the North Bavarian Tableland, Southeastern Germany, fine-grained clastic rocks were deposited in a spectrum of depositional environments. The oldest sediments formed in a playa, the youngest sediments in a nearshore marine depositional system of an epeiric sea. Following a large-scale sampling of drill holes, chemical analyses including major elements (Si, Al, Fe, Mg, Mn, Ca, K, Ti, P, TOC, TSC), trace elements (Ba, Cr, Ga, V, Cu, Pb, Mo, Zn, Ni, Th, U, Zr), organic compounds (e.g. n-alkanes), carbon and oxygen isotopes the interpretation of the palaeogeographic evolution has been performed. During Rhaetian times the sea encroached upon the upper Triassic playa depositional system giving rise to a terrigenous linear shoreline environment which by the beginning of the Liassic was incised by valleys. A short term fluvially-sourced deltaic environment during the Early Liassic was substituted for by another terrigenous linear shoreline environment with palimpsest beach deposits. Subsequently, nearshore brackish marine environments gradually gave way to a fully marine epicontinental depositional system with some shoals scattered across this basin. The chemical composition of phyllosilicates, C isotopes (palaeosalinity indicator), trace elements such as Ba, U, Cu, Pb, Zn, P (palaeoenvironment indicator) and element ratios such as Fe/Mn (redox indicators) prove to be valuable tools to constrain the environment of deposition. Investigations of the organic matter provide a tool to interpret the environment of deposition and determine late stage diagenetic alteration, which took place under the influence of brackish pore waters at temperatures of as much as 70 °C.

AB - From the Late Triassic through the Early Liassic, at the northern edge of the North Bavarian Tableland, Southeastern Germany, fine-grained clastic rocks were deposited in a spectrum of depositional environments. The oldest sediments formed in a playa, the youngest sediments in a nearshore marine depositional system of an epeiric sea. Following a large-scale sampling of drill holes, chemical analyses including major elements (Si, Al, Fe, Mg, Mn, Ca, K, Ti, P, TOC, TSC), trace elements (Ba, Cr, Ga, V, Cu, Pb, Mo, Zn, Ni, Th, U, Zr), organic compounds (e.g. n-alkanes), carbon and oxygen isotopes the interpretation of the palaeogeographic evolution has been performed. During Rhaetian times the sea encroached upon the upper Triassic playa depositional system giving rise to a terrigenous linear shoreline environment which by the beginning of the Liassic was incised by valleys. A short term fluvially-sourced deltaic environment during the Early Liassic was substituted for by another terrigenous linear shoreline environment with palimpsest beach deposits. Subsequently, nearshore brackish marine environments gradually gave way to a fully marine epicontinental depositional system with some shoals scattered across this basin. The chemical composition of phyllosilicates, C isotopes (palaeosalinity indicator), trace elements such as Ba, U, Cu, Pb, Zn, P (palaeoenvironment indicator) and element ratios such as Fe/Mn (redox indicators) prove to be valuable tools to constrain the environment of deposition. Investigations of the organic matter provide a tool to interpret the environment of deposition and determine late stage diagenetic alteration, which took place under the influence of brackish pore waters at temperatures of as much as 70 °C.

UR - http://www.scopus.com/inward/record.url?scp=0034194844&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034194844

VL - 60

SP - 129

EP - 171

JO - Chemie der Erde

JF - Chemie der Erde

SN - 0009-2819

IS - 2

ER -