Multi-stage crustal melting from Late Permian back-arc extension through Middle Triassic continental collision to Late Triassic post-collisional extension in the East Kunlun Orogen

Zhao, Xu; Wei, Jingsong; Fu, Lebing; Huizenga, Jan Marten; Santosh, M.; Chen, Jiajie; Wang, Dianzhong; Li, Aobing

doi:10.1016/j.lithos.2020.105446

Cited by 19 publications

(16 citation statements)

References 56 publications

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“…In (Guo et al, 2012). The data sources are as follows: EKO subduction granites: Chen, Xie, et al, 2013;Ding et al, 2014;Gao et al, 2012;Jian et al, 2017;Zhao et al, 2020;EKO collision granites: Feng et al, 2012;Guo et al, 2016;EKO post-collision granites: Han et al, 2018;Xia, Wang, et al, 2014a;Zhao et al, 2020 this study, the DCG granodiorite samples showed no negative Sr and Eu anomalies, but did show weak negative Ba anomalies, indicating that the granodiorite has experienced K-feldspar fractional crystallization, instead of plagioclase fractional crystallization. The DCG monzogranite samples showed significant negative Sr, Eu, and Ba anomalies, indicating that the monzogranites have undergone separation crystallization of both plagioclase and K-feldspar.…”

Section: Dcg Granodiorites and Monzogranitesmentioning

confidence: 99%

“…The EKO was previously considered to have undergone a complex and unique tectono-magmatic evolution, experiencing many transformations from subductions to subsequent continent-continent collision (Chen et al, 2016;Xu et al, 2011Xu et al, , 2012. During the Late Palaeozoic-Early Mesozoic, the EKO was linked to the A'nyemaqen Ocean and subsequent continental collision occurred (Mo et al, 2007), and numerous rocks that were generated during the tectonic-magmatic events are widely distributed in this region (Ren et al, 2016;Wang et al, 2018;Xin et al, 2019;Zhang, Mo, et al, 2017a;Zhao et al, 2020). The existence of an A'nyemaqen Ocean is supported by the Haerguole ophiolotes (LA-ICP-MS U-Pb age of zircons from gabbros, 332.8 ± 3.1 Ma; Liu et al, 2011) and the Derni ophiolites (whole rock 40Ar-39Ar age of basalts, 345.3 ± 7.9 Ma; SHRIMP U-Pb age of zircons from basalts, 308.0 ± 4.9 Ma; Yang et al, 2009).…”

Section: Tectonic Evolution Of the Ekomentioning

confidence: 99%

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“Scissors‐type” closure of the A'nyemaqen Ocean: Geochronological and geochemical constraints of Late Permian–Triassic granitoids in the East Kunlun Orogen

et al. 2022

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The East Kunlun Orogen (EKO) is located in the western part of China and has witnessed the Late Permian-Triassic tectonic evolution involving the A'nyemaqen Ocean (a part of the Palaeo-Tethys Ocean). In this study, geochronology, geochemistry, and Hf isotope analysis of Late Permian-Triassic granitoids were carried out. Zircon U-Pb dating of Dachagou granodiorite and monzogranite in the western part of the EKO (W-EKO) is 233.4 ± 1.1 and 225.8 ± 1.2 Ma, respectively. The Dachagou granodiorite and monzogranite are characterized by low values of 10, 000 Ga/Al ratios (1.75-2.06, 1.42-1.60) similar to those of I-type granite. The εHf (t) (À2.4 to +0.1, À3.0 to +0.2) indicate that the magma forming these granites was derived from a mafic Mesoproterozoic lower crust. Zircon U-Pb age of Lalingzaohuo quartz diorite is 244.5 ± 2.6 Ma, and its εHf(t) values (À0.7 to +2.5) indicate the origin of crust-mantle mixing. Zircon U-Pb ages for Nagengkangqieer granodiorite and monzogranite in the eastern part of the EKO (E-EKO) are 250.1 ± 2.8 and 238.9 ± 2.2 Ma, respectively. These rocks are also characterized by low 10, 000 Ga/Al ratios (2.37-2.66 and 2.49-2.63) again similar to I-type granite. The εHf(t) (À3.9 to 0.4, À3.3 to 1.1) indicate that the magma was derived from the crustal materials. As contemporaneous rocks, the Dachagou and Nagengkangqieer granodiorites and the Lalingzaohuo quartz diorites are formed in a subduction environment. However, the Dachagou and Nagengkangqieer monzogranites are formed in a collision environment. Based on this result, the closure time of the W-EKO and E-EKO of the A'nyemaqen Ocean had an age gap of $15 Ma, hence the closure mode of the A'nyemaqen Ocean should be a "scissor-type" closure.

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Section: Dcg Granodiorites and Monzogranitesmentioning

confidence: 99%

Section: Tectonic Evolution Of the Ekomentioning

confidence: 99%

“Scissors‐type” closure of the A'nyemaqen Ocean: Geochronological and geochemical constraints of Late Permian–Triassic granitoids in the East Kunlun Orogen

et al. 2022

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“…The SEKB contains Mesozoic-Cainozoic volcanic rocks and sedimentary. Early Palaeozoic-Mesozoic granitoids (466-390 and 257-200 Ma) are widespread in the EKO [22][23][24]. These granitoids mainly include granodiorites, syenogranites, and monzogranites [25,26] that were formed during the subduction of the Proto-and Palaeo-Tethyan oceanic plates [17,25].…”

Section: Regional Geologymentioning

confidence: 99%

Prospecting Potential of the Yanjingou Gold Deposit in the East Kunlun Orogen, NW China: Evidence from Primary Halo Geochemistry and In Situ Pyrite Thermoelectricity

Zeng

Wei³

et al. 2021

Minerals

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The Wulonggou Au district in the East Kunlun Orogen is one of the most important Au producing regions in China. The Yanjingou Au deposit occurs within a shear zone in the northeastern Wulonggou Au district. Based on detailed field investigations, geochemical data for the primary halo, and in situ thermoelectric data for pyrite, the following key results were obtained: (1) the Yanjingou Au deposit has the fractured-altered-rock type gold mineralization that is arsenopyrite-rich; (2) elemental correlations and cluster analysis show that Au and As are the most diagnostic elements; (3) geochemical data for the primary halo indicate the deposit is a shallow supra-ore halo ore body; and (4) in situ pyrite thermoelectric data show that the proportion of P-type pyrite is >80% and the detachment rate is 50%, which can be inferred that the location of the ore body is shallow. Based on our data, we present a mineralization prediction model for the ore body. The Yanjingou Au deposit has a good mineralization and high prospecting potential, with at least half of the ore body being concealed at depth, which has important scientific guiding significance for the breakthrough of prospecting and exploration.

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“…The EKOB belongs to the Tethys tectonic domain, which has an extremely complicated geological history [16][17][18][19]. The evolution of the Proto-Tethys began in the Precambrian and ended in the Devonian, during which the ocean basin was subducted in both directions, creating the basic tectonic framework of the EKOB [20,21].…”

Section: Regional Geologymentioning

confidence: 99%

Tectonomagmatic Setting and Cu-Ni Mineralization Potential of the Gayahedonggou Complex, Northern Qinghai–Tibetan Plateau, China

Norbu

Liu

et al. 2020

Minerals

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The Gayahedonggou magmatic Cu-Ni sulfide deposit was recently discovered in the East Kunlun orogenic belt (Northern Tibetan Plateau, China). The mineralization in this region is associated with mafic–ultramafic intrusions. To date, the formation age and metallogenic model of these ore-bearing intrusions have not been studied systematically. In this paper, the petrology, zircon U-Pb chronology, and geochemistry of ore-bearing wehrlite and quartz diorite are investigated. The results show that the zircon U-Pb isotopic age of wehrlite is 419.9 ± 1.5 Ma with an average εHf(t) value of 3.0, indicating that wehrlite originated from a depleted mantle or the asthenosphere. The (La/Yb)N, (La/Sm)N, (Gd/Yb)N, Nb/U, and Ce/Pb ratios of wehrlite are between 3.01–7.14, 1.69–3.91, 1.36–1.51, 2.07–2.93, and 0.55–1.42, respectively, indicating that the parent magma of the wehrlite had been contaminated by the upper crust. The zircon U-Pb isotopic age of quartz diorite is 410.2 ± 3.5 Ma with an average εHf(t) value of 8.0, and the A/CNK and A/NK ratio of quartz diorites ranges from 1.02 to 1.04 and from 2.13 to 2.23, respectively. These features are similar to those of the type I granite, and the quartz diorite was likely derived from the lower crust. Combined with the regional geological evolution, the Gayahedonggou complex formed in a post-collision extensional environment. The pyroxene in the Gayahedonggou complex is mainly clinopyroxene, which is enriched in the CaO content, indicating that the CaO content of the parent magma of the Gayahedonggou complex is high or that the complex has been contaminated by Ca-rich surrounding rocks, which hinders Cu-Ni mineralization.

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Multi-stage crustal melting from Late Permian back-arc extension through Middle Triassic continental collision to Late Triassic post-collisional extension in the East Kunlun Orogen

Cited by 19 publications

References 56 publications

“Scissors‐type” closure of the A'nyemaqen Ocean: Geochronological and geochemical constraints of Late Permian–Triassic granitoids in the East Kunlun Orogen

“Scissors‐type” closure of the A'nyemaqen Ocean: Geochronological and geochemical constraints of Late Permian–Triassic granitoids in the East Kunlun Orogen

Prospecting Potential of the Yanjingou Gold Deposit in the East Kunlun Orogen, NW China: Evidence from Primary Halo Geochemistry and In Situ Pyrite Thermoelectricity

Tectonomagmatic Setting and Cu-Ni Mineralization Potential of the Gayahedonggou Complex, Northern Qinghai–Tibetan Plateau, China

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