Shoshonitic- and adakitic magmatism of the Early Paleozoic age in the Western Kunlun orogenic belt, NW China: Implications for the early evolution of the northwestern Tibetan plateau

Lithos ◽  
2017 ◽  
Vol 286-287 ◽  
pp. 345-362 ◽  
Author(s):  
Jian Wang ◽  
Keiko Hattori ◽  
Jianguo Liu ◽  
Yue Song ◽  
Yongbao Gao ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Early Evolution ◽  
Orogenic Belt ◽  
Early Paleozoic ◽  
Nw China ◽  
Western Kunlun

scholarly journals Geochemistry and petrogenesis of the early Palaeozoic appinite-granite complex in the Western Kunlun Orogenic Belt, NW China: implications for Palaeozoic tectonic evolution

2017 ◽  
Vol 155 (8) ◽  
pp. 1641-1666 ◽  
Author(s):  
JIE ZHU ◽  
QIUGEN LI ◽  
XU CHEN ◽  
HAOSHU TANG ◽  
ZONGQI WANG ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Crustal Contamination ◽  
Orogenic Belt ◽  
Nw China ◽  
High K ◽  
Western Kunlun ◽  
Wide Range ◽  
Granite Complex ◽  
Early Palaeozoic ◽  
T Values

AbstractThe Datong pluton, the largest early Palaeozoic granitoid in the Western Kunlun Orogenic Belt (WKOB) in NW China, is a typical appinite-granite complex. It consists of diorites, quartz diorites, monzodiorites, quartz monzodiorites, monzonites, quartz monzonites, syenites, granodiorites and monzogranites. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U–Pb dating yielded crystallization ages of 459 ± 3 Ma for the quartz monzonites and 452 ± 5 Ma for the monzogranites (Late Ordovician). The rocks possess a wide range of SiO2 (56.0–73.4 wt %), MgO (0.17–4.55 wt %) and Mg no. (25–60), with high K2O (2.83–5.29 wt %) contents, exhibiting high-K calc-alkaline to shoshonitic traits. They are characterized by enrichments in large-ion lithophile elements (LILEs) and light rare Earth elements (LREEs), as well as depletions in high-field-strength elements (HFSEs). The rocks have initial 87Sr/86Sr ratios of 0.7086–0.7185, negative εNd(t) values of –3.72 to –1.79 and εHf(t) values vary from –1.6 to +4.7. These features are modelled to show that they were most likely derived from an enriched lithospheric mantle source and that fractional crystallization with minor crustal contamination was involved in their petrogenetic process. Considering the distribution and chronology of the Palaeozoic intrusions – such as Kegang, Bulong, Qiukesu, Yierba, North Kudi, Dongbake, Buya, Ayilixi and Warengzilafu granitoid plutons with ages of c. 420–530 Ma – in conjunction with the Palaeozoic metamorphic overprinting in the WKOB, we propose a divergent double-subduction model to explain the destruction of the Proto-Tethys Ocean and suggest that the Datong pluton was likely emplaced in a post-collisional setting following the termination of subduction in response to slab break-off.

Geochronology, petrogenesis and tectonic significance of Dahongliutan pluton in Western Kunlun orogenic belt, NW China

2019 ◽  
Vol 26 (12) ◽  
pp. 3420-3435
Author(s):  
Kun Ding ◽  
Ting Liang ◽  
Xiu-qing Yang ◽  
Yi Zhou ◽  
Yong-gang Feng ◽  
...  
Keyword(s):  
Orogenic Belt ◽  
Nw China ◽  
Western Kunlun ◽  
Tectonic Significance

The distribution, geochronology and geochemistry of early Paleozoic granitoid plutons in the North Altun orogenic belt, NW China: Implications for the petrogenesis and tectonic evolution

Lithos ◽  
2017 ◽  
Vol 268-271 ◽  
pp. 399-417 ◽  
Author(s):  
Ling-Tong Meng ◽  
Bai-Lin Chen ◽  
Ni-Na Zhao ◽  
Yu Wu ◽  
Wen-Gao Zhang ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Orogenic Belt ◽  
Early Paleozoic ◽  
Nw China ◽  
The North
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