An endemic brackish water faunule from the middle jurassic of southern qinghai province, China

PalZ ◽  
1991 ◽  
Vol 65 (1-2) ◽  
pp. 105-117 ◽  
Author(s):  
Jiarun Yin ◽  
Franz T. Fürsich
Keyword(s):  
Brackish Water ◽  
Middle Jurassic ◽  
Qinghai Province

Sequence paleogeography and coal accumulation of the Early–Middle Jurassic in central Qilian Mountain belt (Muli Basin), Qinghai Province, northwestern China

AAPG Bulletin ◽  
2018 ◽  
Vol 102 (09) ◽  
pp. 1739-1762 ◽  
Author(s):  
Xiaoxu Shang ◽  
Longyi Shao ◽  
Wenlong Zhang ◽  
Jinggao Lv ◽  
Weichao Wang ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Northwestern China ◽  
Qilian Mountain ◽  
Qinghai Province ◽  
Mountain Belt ◽  
Coal Accumulation

Ctenophora sinensis: a new diatom species (Bacillariophyta) from China with comments on its structure, nomenclature and relationships

Phytotaxa ◽  
2020 ◽  
Vol 460 (2) ◽  
pp. 115-128
Author(s):  
BING LIU ◽  
DAVID M. WILLIAMS ◽  
ZHU-XIANG LIU ◽  
JIN-HUA CHEN
Keyword(s):  
Brackish Water ◽  
Central Area ◽  
Diatom Species ◽  
Lake Qinghai ◽  
Vegetative Cells ◽  
Qinghai Province ◽  
Water Lake ◽  
Brackish Water Lake

Lake Qinghai is an ancient brackish water lake in the Qinghai province of China. A number of endemic diatom species have already been discovered and described from the lake. This study describes another new endemic diatom species: Ctenophora sinensis sp. nov. Ctenophora sinensis has the following features: (1) frustule and valve are lanceolate; (2) the central area is slightly buttressed internally; (3) its areolae have both outside sieve-like closing plates and inside hymenate occlusions; (4) an apical hyaline field exists near each rimoportula; (5) a pseudoseptum is always presents at each pole; and (6) the cingulum has a 4:2 configuration of girdle bands in normal vegetative cells. Some remarks are provided on the nomenclature of Ctenophora and a few comments on the relationships of the genus.

Sedimentology and Coalbed Methane Geology of Middle Jurassic Coal Measures in Juhugeng Mine, Qinghai Province

2013 ◽  
Vol 734-737 ◽  
pp. 156-160
Author(s):  
Meng Li ◽  
Zheng Fei Zhang ◽  
Sheng Zhang ◽  
Ming Ming Wang ◽  
Xiang Dong Gao ◽  
...  
Keyword(s):  
Coal Mine ◽  
Middle Jurassic ◽  
Coalbed Methane ◽  
Braided River ◽  
Coal Seams ◽  
Isothermal Adsorption ◽  
Qinghai Province ◽  
Mine Area ◽  
Jurassic Coal ◽  
Coal Measures

Field-based lithofacies in the Middle Jurassic coal measures of the Juhugeng coal mine area of Qinghai Province have been identified employing lithology, geometry and lateral facies relationships. The coal measures were deposited in a range of environments spanning from braided river, delta to lake, and economic coal seams have been formed in the deltaic interdistributary bay and fluvial flood basin environments. The coal has a rank ranging from gas coal to coking coal, and the vitrinite macerals have a relatively high content, being from 60%~80%. Cleats and fractures of coal reservoirs are well developed. The isothermal adsorption experiments reveal that coal in the Juhugeng mine has relatively low Langmuir volume and relatively high Langmuir pressure with low to medium absorbability. All these conditions are beneficial to the formation and preservation of the coalbed methane.

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