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Ooid distribution and fabric in the Miaolingian of Xiaweidian Section, Beijing (North China Platform)

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Title Ooid distribution and fabric in the Miaolingian of Xiaweidian Section, Beijing (North China Platform)
 
Creator Hussein, A A A
Latif, K
Shehzad, K
Khaing, K K
Riaz, M
Khan, M U
 
Subject Cambrian
Miaolingian
North China platform ooids
Xiaweidian
 
Description 743-758
This study is an attempt to describe the distribution and fabric of the Cambrian ooids from the Xuzhuang, Zhangxia and
Gushan formations at the Xiaweidian section. The oolitic banks occupy the upper parts of the 3rd order depositional
sequences recognized for these formations. Petrographical techniques were applied to describe the sedimentary features of
ooid grains. Different characteristics of ooids including size distribution, composition, morphology and the internal and
external cortical architecture were taken into consideration. Radial-concentric, micritic, superficial, composite, pseudoooids,
neomorphosed and geopetal ooids are properly studied under the microscope. Different fabrics of ooids have been
linked to their different depositional settings, and a variety of sub-environments has been established. The oolitic grain
banks are composed mainly of calcite, with noteworthy presence of aragonite and dolomite. The two-fold role of
microorganisms during and after the formation of ooids can be recognized under the microscope. The mechanism of ooids
fabric modification has been elaborated in detail. Firstly, the dark laminae in several ooids most probably show the remains
of filamentous cyanobacteria taking part in the construction of ooids. Secondly, they destroy the cortex through boring,
which is then subsequently filled by aragonite. In order to apprehend the sedimentological features of the Miaolingian strata
in the Xiaweidian section, this research highlights the distribution of oolites and their resultant fabric in response to relative
sea-level variations. The Miaolingian ooids in the Xiaweidian section provide a good reference example of the depositional
pattern of oolitic grain banks.
 
Date 2021-12-22T06:49:26Z
2021-12-22T06:49:26Z
2021-09
 
Type Article
 
Identifier 2582-6727 (Online); 2582-6506 (Print)
http://nopr.niscair.res.in/handle/123456789/58638
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJMS Vol.50(09) [September 2021]