2019
DOI: 10.3390/min9070428
|View full text |Cite
|
Sign up to set email alerts
|

Pyrite Morphology as an Indicator of Paleoredox Conditions and Shale Gas Content of the Longmaxi and Wufeng Shales in the Middle Yangtze Area, South China

Abstract: Pyrite is the most common authigenic mineral preserved in many ancient sedimentary rocks. Pyrite also widely exists in the Longmaxi and Wufeng marine shales in the middle Yangtze area in South China. The Longmaxi and Wufeng shales were mainly discovered with 3 types of pyrites: pyrite framboids, euhedral pyrites and infilled framboids. Euhedral pyrites (Py4) and infilled framboids (Py5) belong to the diagenetic pyrites. Based on the formation mechanism of pyrites, the pyrites could be divided into syngenetic p… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

2
35
0
1

Year Published

2020
2020
2022
2022

Publication Types

Select...
8

Relationship

0
8

Authors

Journals

citations
Cited by 53 publications
(38 citation statements)
references
References 57 publications
2
35
0
1
Order By: Relevance
“…The redox conditions of ancient sediments control the enrichment of biological and redox sensitive trace elements. Pyrite morphology and the size distribution of the framboids are used to indicate palaeoredox conditions (Wilkin and Barnes, 1997a;Wignall et al, 2005;Huang et al, 2016;Liu et al, 2019). Such methods are applicable where there is no oxidative weathering.…”
Section: Resultsmentioning
confidence: 99%
“…The redox conditions of ancient sediments control the enrichment of biological and redox sensitive trace elements. Pyrite morphology and the size distribution of the framboids are used to indicate palaeoredox conditions (Wilkin and Barnes, 1997a;Wignall et al, 2005;Huang et al, 2016;Liu et al, 2019). Such methods are applicable where there is no oxidative weathering.…”
Section: Resultsmentioning
confidence: 99%
“…As noted, the majority of the syngenetic pyrites from the Banik area are small framboids (i.e., smaller than 5 μm) suggesting that euxinic conditions were predominant during the time of deposition of the Sargelu and Naokelekan Formations (cf. Liu et al 2019). Interestingly, a recent study (Abdula et al 2020) on Rock-Eval analysis and organic petrographical characterization of the Upper Jurassic Naokelekan Formation from the Northern Mesopotamian Basin in Iraqi Kurdistan suggests that the co-occurrence of bituminite with pyrite framboids is indicative of reducing (anoxic to euxinic) conditions during the time of the deposition of the Naokelekan Formation sediments.…”
Section: Paleoredox Proxiesmentioning
confidence: 98%
“…According to Liu et al (2019), pyrites can be subdivided, based on the formation mechanism, into syngenetic pyrites, early diagenetic pyrites, and late diagenetic pyrites. SEM and EDX analysis revealed the presence of syngenetic pyrites within all of the solid bitumen and host shale samples from the Sargelu and Naokelekan Formations (Fig.…”
Section: Paleoredox Proxiesmentioning
confidence: 99%
“…The Ordos Basin is a stable cratonic basin, which excludes the possibility of volcanism. The pyrite formed by BSR commonly has a negative δ 34 S value with an average from -42.7‰ to -5‰ [46,47]. BSR is known from a multitude of geological settings that range in temperature from 0 to about 80°C [48,49].…”
Section: Dolomitementioning
confidence: 99%