The Sequence Stratigraphy of Transgressive Black Shales

1993 ◽  
Author(s):  
Paul B. Wignall ◽  
James R. Maynard
Keyword(s):  
Sequence Stratigraphy ◽  
Black Shales

Spectral gamma-ray measurements - a key for sequence stratigraphy in black shales: example Posidonia Shale (Lias ɛ, Toarcian, SW-Germany)

2003 ◽  
Vol 2003 (4) ◽  
pp. 193-211 ◽  
Author(s):  
Wolf-Dieter Junghans ◽  
Hans-Joachim Röhl ◽  
Annette Schmid-Röhl ◽  
Thomas Aigner
Keyword(s):  
Sequence Stratigraphy ◽  
Gamma Ray ◽  
Black Shales ◽  
Posidonia Shale

From Basin Black Shales to Platform Carbonate Rocks: A Study on Sequence Stratigraphy for the Lower Cambrian of the Upper-Yangtze Region in South China

2007 ◽  
Vol 81 (5) ◽  
pp. 739-755 ◽  
Author(s):  
MEI Mingxiang ◽  
MA Yongsheng ◽  
ZHANG Hai ◽  
MENG Xiaoqing ◽  
CHEN Yonghong
Keyword(s):  
Sequence Stratigraphy ◽  
South China ◽  
Carbonate Rocks ◽  
Lower Cambrian ◽  
Black Shales

scholarly journals Black shale deposition during Toarcian super-greenhouse driven by sea level

2013 ◽  
Vol 9 (4) ◽  
pp. 4365-4384 ◽  
Author(s):  
M. Hermoso ◽  
F. Minoletti ◽  
P. Pellenard
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Sea Level ◽  
Sequence Stratigraphy ◽  
Carbon Isotopes ◽  
Black Shale ◽  
Black Shales ◽  
Positive Trend ◽  
Sea Level Changes ◽  
Organic Carbon Burial

Abstract. One of the most elusive aspects of the Toarcian Oceanic Anoxic Event (T-OAE) is the paradox between carbon isotopes that indicate intense global primary productivity and organic carbon burial at a global scale, and the delayed expression of anoxia in Europe. During the earliest Toarcian, no black shales were deposited in the European epicontinental seaways, and most organic carbon enrichment of the sediments postdated the T-OAE (defined by the overarching positive trend in the carbon isotopes). In the present studied, we have attempted to establish a sequence stratigraphy framework for Early Toarcian deposits recovered from a core drilled in the Paris Basin using a combination of mineralogical (quartz and clay relative abundance) and geochemical (Si, Zr, Ti and Al) measurements. Combined with the evolution in redox sensitive elements (Fe, V and Mo), the data suggest that expression of anoxia was hampered in European epicontinental seas during most of the T-OAE due to insufficient water depth that prevented stratification of the water column. Only the first stratigraphic occurrence of black shales in Europe corresponds to the "global" event. This interval is characterised by > 10% Total Organic Carbon (TOC) content that contains relatively low concentration of molybdenum compared to subsequent black shale horizons. Additionally, this first black shale occurrence is coeval with the record of the major negative Carbon Isotope Excursion (CIE), likely corresponding to a period of transient greenhouse intensification likely due to massive injection of carbon into the Atmosphere–Ocean system. As a response to enhanced weathering and riverine run-off, increased fresh water supply to the basin may have promoted the development of full anoxic conditions through haline stratification of the water column. In contrast, post T-OAE black shales were restricted to epicontinental seas (higher Mo to TOC ratios) during a period of relative high sea level, and carbon isotopes returning to pre-T-OAE values. Comparing palaeoredox proxies with the inferred sequence stratigraphy for Sancerre suggests that episodes of short-term organic carbon enrichment were primarily driven by third-order sea level changes. These black shales exhibit remarkably well-expressed higher-frequency cyclicities in the concentration of redox-sensitive elements such as iron or vanadium whose nature has still to be determined through cyclostratigraphic analysis.

Trace Element Geochemistry of Black Shales in Singhbhum Mobile Belt, Eastern India: Implications For Source Rock and Paleoredox Conditions

2012 ◽  
Vol 3 (1) ◽  
pp. 185-188
Author(s):  
Akhtar R Mir ◽  
◽  
Zubair A Bhat ◽  
Shabber. H Alvi ◽  
V. Balaram V. Balaram
Keyword(s):  
Trace Element ◽  
Source Rock ◽  
Black Shales ◽  
Mobile Belt ◽  
Trace Element Geochemistry ◽  
Eastern India ◽  
Element Geochemistry
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