Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6350134 | Palaeogeography, Palaeoclimatology, Palaeoecology | 2014 | 14 Pages |
Abstract
Facies 1 is characterized by bioclastic, peloidal, and intraclastic grainstone and packstone containing massive normal grading and cross-laminations, and is interpreted to represent deep ramp carbonates above storm wave base. Facies 2 is represented by typical lag deposits overlying a transgressive surface. Facies 3 comprises organic-carbon-rich black shale and minor scour-filling bioclastic, peloidal, and intraclastic packstone, and may represent a marginal basin plain environment surrounding a carbonate ramp. The alternations of organic-carbon-rich black shale and dark gray packstone (Facies 3) show no evidence of bioturbation and have high TOC contents (0.18-5.73Â wt.%). A minor succession within the transgressive lag deposits (from Bed 115b of Facies 2 to Beds 115c-120 in the lower part of Facies 3) is equivalent to the Hangenberg Black Shale (s. l.) in the middle part of the Siphonodella praesulcata to Siphonodella sulcata zones, because Beds 115b-120 characterized by no evidence of bioturbation and high TOC contents are interpreted to be accumulated in anoxic to dysoxic conditions.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Toshifumi Komatsu, Satoru Kato, Kento Hirata, Reishi Takashima, Yukari Ogata, Masahiro Oba, Hajime Naruse, Phuong H. Ta, Phong D. Nguyen, Huyen T. Dang, Truong N. Doan, Hung H. Nguyen, Susumu Sakata, Kunio Kaiho, Peter Königshof,