Mesoproterozoic continental arc magmatism and crustal growth in the eastern Central Tianshan Arc Terrane of the southern Central Asian Orogenic Belt: Geochronological and geochemical evidence

He, Zhenyu; Klemd, Reiner; Zhang, Zeming; Zong, Keqing; Sun, Liang; Zhang, Tian; Huang, Boyang

doi:10.1016/j.lithos.2015.08.009

Cited by 119 publications

(85 citation statements)

References 81 publications

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“…0.9 Ga, and ca . 0.78–0.73 Ga recorded mainly by granitic gneisses have been identified recently in the Central Tianshan Block (J. Gao et al, ; He et al, ; He et al, ; Huang et al, 2014; B. T. Huang, He, Zong, & Zhang, ; Lei et al, ; Z. M. Wang, Han, et al, ; X. S. Wang, Gao, et al, ; X. S. Wang et al, ). Numerous economic metallic deposits, such as Cu–Ni, Au, Pb–Zn, and Fe deposits were discovered along the zone, endorsing the significant metallogenic potential of the Central Tianshan Block (Hou et al, ; X. W. Huang, Gao, et al, ; X. W. Huang, Qi, Gao, & Zhou, ; Qin et al, ; J.…”

Section: Geological Settingmentioning

confidence: 97%

“…Located between the Tarim Block (to the south) and the Turpan–Hami Block (to the north), the Eastern Tianshan is defined as the part of the Chinese Tianshan Belt east of Urumqi and is an important tectonic terrain of the southern Central Asian Orogenic Belt (CAOB). It consists of four main tectonic units: the Bogeda–Haerlike zone in the north, the Jueluotage zone in the middle, and the Central Tianshan Block and the South Tianshan zone in the south (Figure ; He et al, ; Su et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

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Formation age and geodynamic setting of the Neoproterozoic Shalong iron formation in the Central Tianshan, NW China: Constraints from zircon U–Pb dating, geochemistry, and Hf–Nd isotopes of the host rocks

Lei

Feng

et al. 2018

Geological Journal

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The recently discovered Shalong iron deposit in the Central Tianshan with a reserve of 14 Mt of iron at 25–30 wt.% Fe shows the typical iron formation geological characteristics: The host rocks are mainly metamorphosed volcanic rocks including quartz hornblende schist, mica quartz schist, and plagioclase amphibolite; the iron orebodies are stratiform and bedded, indicative of strata‐controlled deposits; metallic minerals are dominated by magnetite with haematite and ilmenite in minor quantities, whereas gangue minerals are quartz, amphibole, chloritoid, and plagioclase; and ore textures are banded and laminated. Here, we present LA‐ICP‐MS zircon U–Pb ages, whole‐rock geochemistry, Sm–Nd isotope, and zircon Lu–Hf isotope analyses on the host rocks in order to constrain the timing and geodynamic setting of the deposit. The geochemical characteristics, Sm–Nd isotope, and zircon Lu–Hf isotope compositions of the host rocks indicate that their protoliths were likely basic and felsic volcanic rocks. The bimodal kind rock types, the juvenile Nd–Hf isotopic characters, and the within‐plate trace element geochemical features of the host rocks together indicate that these rocks formed in a rift‐like extensional setting. Zircon U–Pb dating of the host rock interlayer suggests that the Shalong iron formation was formed in the Neoproterozoic (ca. 760 Ma). Combined with geological characteristics, close association with meta‐volcanic rocks, absence of glacial deposits, and within‐plate geochemical and juvenile isotopic signatures of the host rocks, the Shalong iron deposit is interpreted to be an Algoma‐type Neoproterozoic iron formation. The formation of this deposit can be linked to rift‐like volcanic activities related to the breakup of the Rodinia supercontinent. Our results in conjunction with previous studies suggest that the Central Tianshan should be related to the breakup of Rodinia, as indicated by the Neoproterozoic rift‐related igneous events of the Central Tianshan.

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Section: Geological Settingmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

Formation age and geodynamic setting of the Neoproterozoic Shalong iron formation in the Central Tianshan, NW China: Constraints from zircon U–Pb dating, geochemistry, and Hf–Nd isotopes of the host rocks

Lei

Feng

et al. 2018

Geological Journal

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“…The NTAC mainly composed of Early Carboniferous pyroclastic rocks and calc‐alkali felsic volcanic rocks with discontinuous relics of ophiolitic mélanges (Wang, Zhang, Liu, & Que, ; Xiao et al, ; Yuan et al, ). Both the YB and the CTA are characterized by Precambrian basement and Palaeozoic to Early Mesozoic granitic rocks (Dong et al, ; Han, Ji, Song, Chen, & Li, ; He et al, ; He et al, ; Hu et al, ; Hu, Zhang, Zhang, & Chen, ; Lei et al, ; Ma et al, , ; Yang, Li, Sun, & Wang, ). The STAC is composed of ophiolite mélanges, accretionary complexes (Gao & Klemd, ; Xiao et al, ), and 490–270 Ma granitic rocks mainly occurred in its west segment (Ge et al, ; Ge et al, ; Huang et al, ; Jian et al, ; Long et al, ; Seltmann, Konopelko, Biske, Divaev, & Sergeev, ; Wang, Zhang, Zhang, & Qi, ; Xu et al, ; Zhu et al, ; Zhu et al, ).…”

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

“…1.4 Ga) and Neoproterozoic (ca. 900 Ma) granitic gneisses and Neoproterozoic schists, paragneisses, and calcium silicates are also widely exposed in this area (He et al, ; He et al, ; Huang et al, ; Huang, He, Zong, & Zhang, ). The quartz diorite (sample X12‐30‐3) consists of plagioclase (~50 vol.%), K‐feldspar (~15 vol.%), amphibole (~15 vol.%), biotite (~10 vol.%), and quartz (5 vol.%; Figure a).…”

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

Geochemistry and tectonic implications of Early Permian granitic rocks in the Xingxingxia area of Chinese Central Tianshan Arc Terrane

Wen

Zhang

2018

Geological Journal

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The Chinese Central Tianshan Arc Terrane (CTA) in the southern Central Asian Orogenic Belt is characterized by voluminous Palaeozoic to Mesozoic (500–240 Ma) granites, with a magmatic “flare‐up” at Early Permian time (ca. 280 Ma). However, the tectonic setting of the Early Permian granites in the CTA is highly debated. In this study, Early Permian (ca. 280 Ma) granitic intrusions, including quartz diorite and dioritic enclave, amphibole granite, biotite granite, dioritic porphyry dyke, and a weakly mylonitic granitic dyke, were revealed from the Xingxingxia area of the CTA by LA‐ICP‐MS zircon UPb dating. These granitic rocks show magnesian and calc‐alkaline affinities and are characterized by Nb, Ta, P, Ti, and MREE depletion [(Dy/Yb)N = 1.02–1.51] with no significant Eu anomalies, suggesting geochemical characteristics of typical active continental margin magmatic rocks. Zircon trace element geochemistry of these Early Permian granitic rocks also indicates a continental arc setting with high U/Yb and Gd/Yb ratios. Among these granitic intrusions, the dioritic porphyry dyke has negative zircon εHf(t) values (−8.0 to −5.7), suggesting that the magma was produced by partial melting of the ancient crustal basements of the CTA. The rest intrusions show positive but largely varied zircon εHf(t) values of +4.1 to +10.9 (5 samples), suggesting that the magmas were probably derived from the mantle wedge with variable contributions from ancient crustal component during the magma evolution. These granitic intrusions were coeval with high‐temperature metamorphic rocks, mafic‐ultramafic rocks, and Cu‐Ni sulphide deposits in the CTA. Therefore, we propose a geodynamic model of oceanic ridge subduction of the South Tianshan Ocean during Early Permian involving upwelling of asthenospheric mantle through slab window and partial melting of the mantle wedge. The multiple‐derived magmas, including those from mantle wedge and/or ancient crustal basement, and their blendings formed the studied Early Permian granitic associations in the CTA.

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“…The CAOB is thought to have formed by multiple accretion and collision events of various microcontinents, island arcs, oceanic plateaus and accretionary wedges due to the closure of the Paleo-Asia Ocean Windley et al, 2007;Xiao et al, 2009;He et al, 2015). The Irtysh tectonic belt is located in the middle-western part of the CAOB (Fig.…”

Section: Introductionmentioning

confidence: 99%

The tectonic evolution of the Irtysh tectonic belt: New zircon U–Pb ages of arc-related and collisional granitoids in the Kalaxiangar tectonic belt, NW China

Hong

Klemd

Gao

et al. 2017

Lithos

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Mesoproterozoic continental arc magmatism and crustal growth in the eastern Central Tianshan Arc Terrane of the southern Central Asian Orogenic Belt: Geochronological and geochemical evidence

Cited by 119 publications

References 81 publications

Formation age and geodynamic setting of the Neoproterozoic Shalong iron formation in the Central Tianshan, NW China: Constraints from zircon U–Pb dating, geochemistry, and Hf–Nd isotopes of the host rocks

Formation age and geodynamic setting of the Neoproterozoic Shalong iron formation in the Central Tianshan, NW China: Constraints from zircon U–Pb dating, geochemistry, and Hf–Nd isotopes of the host rocks

Geochemistry and tectonic implications of Early Permian granitic rocks in the Xingxingxia area of Chinese Central Tianshan Arc Terrane

The tectonic evolution of the Irtysh tectonic belt: New zircon U–Pb ages of arc-related and collisional granitoids in the Kalaxiangar tectonic belt, NW China

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