Modal and Geochemical Compositions of the Lower Silurian Clastic Rocks In North Qilian, Nw China: Implications For Provenance, Chemical Weathering, and Tectonic Setting

2012 ◽  
Vol 82 (2) ◽  
pp. 92-103 ◽  
Author(s):  
J. Yang ◽  
Y. Du ◽  
P. A. Cawood ◽  
Y. Xu
Keyword(s):  
Chemical Weathering ◽  
Tectonic Setting ◽  
Nw China ◽  
Lower Silurian ◽  
Clastic Rocks ◽  
North Qilian

Petrology of Upper Ordovician – Lower Silurian rocks of the Antigonish Highlands, Nova Scotia

1987 ◽  
Vol 24 (4) ◽  
pp. 752-759 ◽  
Author(s):  
J. B. Murphy
Keyword(s):  
Nova Scotia ◽  
Late Stage ◽  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Late Ordovician ◽  
Geological History ◽  
Upper Ordovician ◽  
Marine Transgression ◽  
Lower Silurian ◽  
Clastic Rocks

Upper Ordovician to Lower Silurian rocks in the Antigonish Highlands consist of interlayered basalts, rhyodacites, arkoses, and conglomerates overlain by a thick sequence of marine clastic rocks and minor rhyolites. The stratigraphy documents a marine transgression. The volcanic rocks were deposited in a within-plate, continental, extensional environment. The basalts display alkalic and tholeiitic affinities, and the rhyodacites were formed by anatexis of the crust. The origin of the younger rhyolites is not clear: they are compositionally distinct from the rhyodacites but may be related to them as late-stage differentiates. At present, it is not possible to evaluate whether the tectonic setting and magmatic affinities are regionally or locally controlled.The geological history is very similar to that of Lower Silurian rocks immediately north of the Antigonish Highlands at Arisaig. In the simplest sense, this indicates these areas may have been juxtaposed prior to the Late Ordovician and limits cumulative post-Silurian movement on the boundary (Hollow) fault to about 40 km.

Whole-rock and zircon geochemistry of the Xiaoliugou granites, North Qilian Orogen (NW China): Implications for tectonic setting, magma evolution and W–Mo mineralization

2019 ◽  
Vol 115 ◽  
pp. 103166 ◽  
Author(s):  
Tian-Guo Wang ◽  
Huan Li ◽  
Ji-Shun Liu ◽  
Noreen J. Evans ◽  
Yu-Chao Wang ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Magma Evolution ◽  
Nw China ◽  
Qilian Orogen ◽  
North Qilian

Origin of chert in the Upper Ordovician–Lower Silurian: implications for the sedimentary environment of North Qilian Orogen

2021 ◽  
pp. 1-16
Author(s):  
Qian HOU ◽  
Chuanlong MOU ◽  
Zuozhen HAN ◽  
Xiangying GE ◽  
Qiyu WANG
Keyword(s):  
Volcanic Ash ◽  
Tectonic Setting ◽  
Sedimentary Environment ◽  
Late Ordovician ◽  
Upper Ordovician ◽  
Lower Silurian ◽  
The North ◽  
Qilian Orogen ◽  
North Qilian ◽  
Deep Water Basin

ABSTRACT During the Upper Ordovician–Lower Silurian, chert was widely distributed in the Zhongbao Formation in the eastern part of the North Qilian Orogen. The origin and the tectonic setting of these chert were largely unknown. In order to analyse the material provenance, sedimentary environment, their formation and the tectonic setting, we present petrology and geochemical research on chert samples collected from Shihuigou Section. The evidence provided by radiolarite occurrences, Aluminium (Al)–iron (Fe)–manganese diagram and the silicon(Si)/Si + Al + Fe + calcium ratios suggesting a non-hydrothermal input and the biogenic origin chert. The geochemical features and the petrographic signatures have shown that the chert was also influenced by a terrigenous origin. It is considered that the deposition of the Late Ordovician chert is mainly affected by tectonic collision and volcanic ash events. During the Late Ordovician–Early Silurian transition, huge amounts of volcanic ash were released by massive volcanic activity that fell into the ocean, triggering the proliferation of radiolarians. Finally, in the Late Ordovician–Lower Silurian the tectonic setting of the North Qilian Orogen was not a typical deep-water basin, nor a typical continental margin, but a multi-island deep-water basin, which is closed to the mainland.

Petrography and geochemistry of the Lower Silurian sandstones from the Angzanggou Formation in the North Qilian Belt, China: implications for provenance, weathering and tectonic setting

2019 ◽  
Vol 157 (3) ◽  
pp. 477-496
Author(s):  
Qian Hou ◽  
Chuanlong Mou ◽  
Zuozhen Han ◽  
Qiyu Wang ◽  
Zhiyuan Tan ◽  
...  
Keyword(s):  
Sedimentary Cover ◽  
Tectonic Setting ◽  
Orogenic Belt ◽  
Source Rocks ◽  
Petrographic Analysis ◽  
The Tibetan Plateau ◽  
Lower Silurian ◽  
The North ◽  
North Qilian Orogenic Belt ◽  
North Qilian

AbstractThe North Qilian Orogenic Belt is on the northeastern margin of the Tibetan Plateau. It is connected with the Alxa Block in the north and the Tethyan orogenic assemblage in the south. The Lower Silurian Angzanggou Formation, deposited in the northern area of the North Qilian Orogenic Belt, is the most important for revealing the architecture and orogenic processes of the North Qilian Belt. Provenance analysis of the Angzanggou Formation can reveal not only the tectonic evolution of the central orogenic belt of China but also Palaeozoic Asia plate reconstructions. Petrographic analysis indicated that the compositional and textural maturity of the sandstones was low. The detrital composition of the Angzanggou Formation samples consists of quartz (8–14 %), feldspar (6–29 %) and lithic fragments (56–86 %). The sandstones could be classified as litharenites or feldspathic litharenites. The detrital modal composition suggests that these sandstones were probably deposited in a fore-arc basin. The element ratios and some discrimination diagrams based on geochemistry indicate that felsic and intermediate rocks were the main source rocks. The SiO2/Al2O3 ratio, the index of chemical variability and the Th/Sc versus Zr/Sc discrimination diagram suggest that the compositional maturity and degree of recycling were moderate to low. The index of alteration (CIA) and the A–CN–K diagram indicate the intensity of weathering was moderate. The discrimination diagrams based on major and trace elements and petrographic discrimination diagrams imply that the Angzanggou Formation rocks were derived from a continental island arc, and a sedimentary cover probably overlaid the volcanic arc. Therefore, we infer that during Early Silurian time the North Qilian Belt sediments accumulated in a fore-arc basin.

Paleozoic magmatism and porphyry Cu-mineralization in an evolving tectonic setting in the North Qilian Orogenic Belt, NW China

2016 ◽  
Vol 122 ◽  
pp. 20-40 ◽  
Author(s):  
Kun-Feng Qiu ◽  
Jun Deng ◽  
Ryan D. Taylor ◽  
Kai-Rui Song ◽  
Yao-Hui Song ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Orogenic Belt ◽  
Nw China ◽  
Porphyry Cu ◽  
The North ◽  
North Qilian Orogenic Belt ◽  
North Qilian

Petrogenesis and tectonic evolution of the Palaeozoic to Mesozoic Niuxinshan granitoids in the North Qilian orogen, NW China

2021 ◽  
Author(s):  
Fan Yang ◽  
Fei Xue ◽  
M. Santosh ◽  
Zesheng Qian ◽  
Cun Zhang ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Nw China ◽  
The North ◽  
Qilian Orogen ◽  
North Qilian

Forming age and tectono-petrogenises of the Jiugequan ophiolite in the North Qilian Mountain, NW China

2010 ◽  
Vol 55 (18) ◽  
pp. 1899-1907 ◽  
Author(s):  
XiaoHong Xia ◽  
ShuGuang Song
Keyword(s):  
Qilian Mountain ◽  
Nw China ◽  
The North ◽  
North Qilian
Sign in / Sign up

Export Citation Format

Share Document