气候变化领域集成服务门户(CCPortal): The Late Ordovician granitoids in the East Kunlun Orogenic Belt; Northwestern China: petrogenesis and constraints for tectonic evolution of the Proto-Tethys Ocean

CCPortal

DOI	10.1007/s00531-019-01787-7
	The Late Ordovician granitoids in the East Kunlun Orogenic Belt; Northwestern China: petrogenesis and constraints for tectonic evolution of the Proto-Tethys Ocean
	Li J.; Qian Y.; Li H.; Sun J.; Yang X.; Chen B.; Fan X.; Sun F.
发表日期	2020
ISSN	14373254
起始页码	1439
结束页码	1461
卷号	109 期号:4
英文摘要	Petrology, whole-rock geochemistry, in situ zircon U–Pb ages, and Lu–Hf isotopic data are reported for granodiorite and monzonitic granite samples from the Harizha Region in the eastern section of the East Kunlun Orogenic Belt. The results of the LA-ICP-MS zircon dating indicate that the granodiorite and monzonitic granite were emplaced at 447.9 ± 3.0 Ma and 443.8 ± 3.5 Ma, respectively, i.e., in the Late Ordovician–Early Paleozoic periods. The granodiorite is characterized by relatively high MgO (4.52–5.91 wt%), Sr (541–712 ppm), Cr (218–357 ppm), Ni (56.7–80.7 ppm) and V (66.8–94.7 ppm), with low Y (10.40–13.60 ppm) and Yb (1.05–1.45) contents. This results in elevated Mg# (65–68), Sr/Y (39.78–58.84), and (La/Yb)N (10.21–18.30) ratios, common features for adakitic high-Mg andesite (HMA). The granodiorite is metaluminous to weakly peraluminous and high-K calc-alkaline in composition. In addition, the granodiorite is enriched in light rare-earth elements (LREE) and large ion lithophile elements (LILEs, Rb, K, Sr, and Pb) U, and Nd; and depleted in high-field strength elements (HFSEs, Nb, Ta, Zr, Hf, Ti) and P. The zircon grains from the granodiorites have εHf(t) values of − 5.5 to + 4.7, with two-stage Hf model ages (tDM2) ranging from 0.92 to 1.71 Ga. These features suggest that the granodiorites were formed by mixing processes of crustal melts and magma from a metasomatized mantle in a subduction setting. The monzonitic granite possesses high normative corundum values (2.34–4.10 wt%), is strongly peraluminous (A/CNK ratios of 1.16–1.32, with minor mineral muscovite), with high-K calc-alkaline affinity. Furthermore, enrichments in large ion lithophile elements (Rb, K, and Pb), U, Th, and Nd, depletions in high-field strength elements (Nb, Ta, and Ti) and Ba and P, and mainly right-inclined REE patterns with negative Eu anomalies, exhibits an S-type granite affinity. The magmatic zircons from the monzonitic granite yielded εHf(t) values between − 4.9 and − 2.7, corresponding to two-stage Hf model ages of 1.60–1.73 Ga. Therefore, this study suggests that the monzonitic granite magma was derived from crustal material (metagreywacke) in a syn-collision setting. Subsequently, by combining these findings with the previous research results, this study propose that a transverse diachronism closure model which entailed an “earlier on the sides–later in the middle” in an East–West direction in the East Kunlun Orogenic Belt for the Proto-Tethys Ocean’s evolution process. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	East Kunlun Orogenic Belt; HMAS; Late Ordovician; Proto-Tethys Ocean; S-type granite; Transverse diachronism closure model
语种	英语
scopus关键词	emplacement; formation mechanism; granitoid; granodiorite; igneous geochemistry; monzonite; Ordovician; orogenic belt; paleoceanography; petrogenesis; petrology; tectonic evolution; tectonic setting; uranium-lead dating; China; Kunlun Mountains
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147681
作者单位	College of Earth Sciences, Jilin University, No. 2199, Jianshe Street, Changchun, 130061, China; Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Nature Resources of China, Changchun, 130061, China
推荐引用方式 GB/T 7714	Li J.,Qian Y.,Li H.,et al. The Late Ordovician granitoids in the East Kunlun Orogenic Belt; Northwestern China: petrogenesis and constraints for tectonic evolution of the Proto-Tethys Ocean[J],2020,109(4).
APA	Li J..,Qian Y..,Li H..,Sun J..,Yang X..,...&Sun F..(2020).The Late Ordovician granitoids in the East Kunlun Orogenic Belt; Northwestern China: petrogenesis and constraints for tectonic evolution of the Proto-Tethys Ocean.International Journal of Earth Sciences,109(4).
MLA	Li J.,et al."The Late Ordovician granitoids in the East Kunlun Orogenic Belt; Northwestern China: petrogenesis and constraints for tectonic evolution of the Proto-Tethys Ocean".International Journal of Earth Sciences 109.4(2020).