Meteoric diagenesis below a submerged platform: implications for δ13C compositions prior to pre-vascular plant evolution, Middle Ordovician, Alabama, U.S.A
In: Sedimentary geology, Jg. 90 (1994), Heft 1-2, S. 95-111
academicJournal
- print, Illustration, Tableau, 1 p.1/2
Zugriff:
The Middle Ordovician «Chickamauga» Formation at Red Mountain Expressway (RME) and Tidwell Hollow (TWH) sections in Alabama (U.S.A) has a complex early diagenetic history. Early diagenetic history of the buildup facies consisted of two phases of marine cementation separated by two generations of meteoric, equant calcite with moldic dissolution separating equant calcite generations. A third generation of meteoric, equant (drusy) calcite is present after secondary marine diagenesis. Equant (drusy) calcite is interpreted as meteoric because its stable isotopic composition (δ13C = - 0.1 to - 1.6‰, δ 18O = - 4.8 to - 7.3‰) is marine or mixing zone precipitation. Equant (drusy) calcite from buildup facies is mostly non-luminescent and non-ferroan.
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Meteoric diagenesis below a submerged platform: implications for δ13C compositions prior to pre-vascular plant evolution, Middle Ordovician, Alabama, U.S.A
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Autor/in / Beteiligte Person: | TOBIN, K. J ; WALKER, K. R |
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Zeitschrift: | Sedimentary geology, Jg. 90 (1994), Heft 1-2, S. 95-111 |
Veröffentlichung: | Amsterdam: Elsevier, 1994 |
Medientyp: | academicJournal |
Umfang: | print, Illustration, Tableau, 1 p.1/2 |
ISSN: | 0037-0738 (print) |
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