Zircon U–Pb and molybdenite Re–Os geochronology, Hf isotope analyses, and whole-rock geochemistry of the Donggebi Mo deposit, eastern Tianshan, Northwest China, and their geological significance

Zhang, Fangfang; Wang, Yin‐Hong; Liu, Jiajun; Wang, Jianping

doi:10.1080/00206814.2015.1013067

Cited by 51 publications

(19 citation statements)

References 62 publications

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“…Few ~250 to ~222 Ma igneous rocks have been found in the Eastern Tianshan, e.g., ~235 Ma Donggebi porphyritic granitic pluton (Y. S. Wu, Zhou, Li, & Chen, ; F. F. Zhang, Wang, Liu, & Wang, ), ~235 to ~245 Ma Baishan granitic pluton (H. Q. Li, Chen, et al, ), and ~236 Ma Weiya composite pluton (Y. W. Wang, Wang, Wang, & Long, ) (see the compiled dataset by S. Li, Wang, Wilde, & Tong, ). Some authors (e.g., Gu et al, ; Zhang et al, ) proposed that emplacement of the Weiya pluton in the Eastern Tianshan was related to the tectonic switch from the Palaeo‐Asian Ocean subduction‐collision system to the Palaeo‐Tethys Ocean regime.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, we speculate that the distribution of Triassic magmatism in the Western Tianshan was fairly limited and probably did not occur in terranes north of the STT. Few~250 to~222 Ma igneous rocks have been found in the Eastern Tianshan, e.g.,~235 Ma Donggebi porphyritic granitic pluton (Y. S. Wu, Zhou, Li, & Chen, 2017;F. F. Zhang, Wang, Liu, & Wang, 2015), 235 to~245 Ma Baishan granitic pluton (H. Q.…”

Section: Palaeozoic Accretionary Orogenesismentioning

confidence: 99%

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Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

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The South Tianshan Terrane (STT) is located in the boundary between the south‐western Central Asian Orogenic Belt (CAOB) and the Tarim Craton and is a key area for understanding the geologic and tectonic history of the craton and the orogenic belt. In this paper, we report detrital zircon ages from the Late Palaeozoic and Mesozoic clastic sedimentary rocks from the southern part of STT. In combination with the U–Pb ages for felsic igneous and meta‐igneous rocks exposed in the STT and adjacent tectonic units, we identify several distinct age populations. Provenance analysis suggests that the detrital zircon grains were predominately derived from the felsic magmatic rocks in the Tarim Craton and South Tianshan Terrane. The pre‐Neoproterozoic age populations may be associated with the early history of the Tarim Craton. Several pulses of Neoproterozoic magmatism are revealed by our dataset, presumably related to the assembly and break‐up of the supercontinent Rodinia. The 995 to 901 Ma detrital zircon grains were likely sourced from magmatic rocks associated with the assembly of Neoproterozoic Tarim to Australia. Among the age population of 886 to 752 Ma, the older group might be related to the subduction‐related magmatism after the assembly of Rodinia, and the younger one records a protracted magmatic event in a continental rift‐related setting associated with the break‐up of Rodinia. Two younger Neoproterozoic age populations (736 to 694 Ma and 665 to 610 Ma), showing narrow spreads with weak peaks, represent the waning stages of igneous activities related to the break‐up of Rodinia. Regarding the Palaeozoic evolution, together with other evidence, our data indicate a two‐stage subduction model for the SW Palaeo‐Asian Ocean. The 490 to 384 Ma age population corroborates the existence of Early Palaeozoic continental arc magmatism at the northern margin of Palaeozoic Tarim generated by the bidirectional subduction of the South Tianshan Ocean. After a ~30 My period of tectonomagmatic quiescence, the second stage is marked by the northward subduction of the South Tianshan Terrane during Late Devonian to Early Carboniferous. The final collision of Tarim and the south‐western CAOB likely occurred during the Late Carboniferous, followed by syn‐ and post‐collisional magmatism, as represented by the 320 to 265 Ma age population. Based on the detrital zircon ages in conjunction with the Hf isotopic features of zircons from Palaeozoic igneous rocks, our study does not support the model of large‐scale Phanerozoic net continental growth in the South Tianshan Terrane.

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Section: Discussionmentioning

confidence: 99%

Section: Palaeozoic Accretionary Orogenesismentioning

confidence: 99%

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

et al. 2018

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“…Diagram of εHf(t) versus U–Pb ages of the Eastern Tianshan igneous rocks. Data for the Donggebi granitoids (after F. F. Zhang, Wang, Liu, & Wang, ), Xingshan gabbro (after C. M. Han et al, ), Bogda rhyolite (after X. Chen, Shu, & Santosh, ), Yandong tonalite (after Y. H. Wang et al, ), and Yudai quartz dioritic porphyry (after Y. Sun et al, )…”

Section: Resultsmentioning

confidence: 99%

Petrogenesis of rhyolite at Kalatage in the Eastern Tianshan, Northwest China: Evidences from geochemistry, zircon U–Pb geochronology, and Hf isotopes

et al. 2018

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The Central Asian Orogenic Belt was one of the most important sites for juvenile crustal growth during the Phanerozoic worldwide, and Eastern Tianshan, Northwest China, located in southern Central Asian Orogenic Belt, is one of the key areas for unravelling the accretionary processes and continental growth. Zircon U–Pb geochronological, Hf isotopic, and whole‐rock geochemical analyses are reported for the Upper Carboniferous Qishan Formation rhyolites from the Kalatage area in the middle of the Harlik–Dananhu arc, Eastern Tianshan, to investigate its petrogenesis and geodynamic setting. Zircon U–Pb ages obtained by laser‐ablation inductively coupled mass spectrometry (LA‐ICP‐MS) indicated that zircon crystallization age of the rhyolite was 299.1 ± 2.1 Ma. The rhyolites are classified as subalkaline and high‐K calc‐alkaline series with A/CNK values mainly lower than 1.10. The REE patterns exhibit right inclined curves with negative Eu anomalies, and the trace element spider diagrams show depletions in Nb, Ta, and Eu, which is consistent with the geochemical characteristics of the island arc calc‐alkaline magma suffered fractional crystallization. In situ zircons Hf isotopic analyses yielded positive initial εHf(t) values ranging from 8.0 to 11.9 and the two‐stage Hf isotope crustal model ages (TDMC) of 554 to 807 Ma. It indicated that the rhyolite was derived from remelting of juvenile crust. The geochemical data for the rhyolites indicate that they were probably generated in a suprasubduction zone setting. It is proposed that the North Tianshan oceanic crust subducted northward beneath the Harlik–Dananhu arc during the Late Upper Carboniferous, and the rhyolites were derived from remelting of juvenile crust and generated in a suprasubduction zone setting.

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“…The Eastern Tianshan‐Beishan Orogenic Belt is an important polymetallic mineral province in China. Important Au–Cu–Mo discoveries in the past decades include the giant Donggebi (Wu et al, , , ; Zhang et al, ) and Baishan (Xiang et al, ; Wang et al, ; Zhang et al, , b) porphyry Mo deposits, and the large Tuwu‐Yandong porphyry Cu deposits (Wang et al, ; Xiao et al, , b). Comparatively, discoveries of epithermal deposits in the region (and the studies about them) are rare, with the only exceptions being the Nanjinshan (Jiang et al, ; Cao et al, , ) and Mazhuangshan (Qin et al, ; Pan & Liu, ; Chen et al, ) deposits.…”

Section: Introductionmentioning

confidence: 99%

Genesis of the Xiuwenghala Gold Deposit in the Beishan Orogen, Northwest China: Evidence from Geology, Fluid Inclusion, and H–O–S–Pb Isotopes

et al. 2019

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The Xiuwenghala gold deposit is located in the Beishan Orogen of the southern Central Asian Orogenic Belt. The vein/lenticular gold orebodies are controlled by Northeast-trending faults and are hosted mainly in the brecciated/ altered tuff and rhyolite porphyry of the Lower Carboniferous Baishan Formation. Metallic minerals include mainly pyrite and minor chalcopyrite, arsenopyrite, galena, and sphalerite, whilst nonmetallic minerals include quartz, chalcedony, sericite, chlorite, and calcite. Hydrothermal alterations consist of silicic, sericite, chlorite, and carbonate. Alteration/mineralization processes comprise three stages: pre-ore silicic alteration (Stage I), syn-ore quartz-chalcedony-polymetallic sulfide mineralization (Stage II), and post-ore quartz-calcite veining (Stage III). Fluid inclusions (FIs) in quartz and calcite are dominated by L-type with minor V-type and lack any daughter mineral-bearing or CO 2 -rich/-bearing inclusions. From Stages I to III, the FIs homogenized at 240-260 C, 220-250 C, and 150-190 C, with corresponding salinities of 2.9-10.9, 3.2-11.1, and 2.9-11.9 wt.% NaCl eqv., respectively. The mineralization depth at Xiuwenghala is estimated to be relatively shallow (<1 km). FI results indicate that the ore-forming fluids belong to a low to medium-temperature, low-salinity, and low-density NaCl-H 2 O system. The δ 18 O H2O values decrease from Stage I to III (3.7‰, 1.7-2.4‰, and −1.7 to 0.9‰, respectively), and a similar trend is found for their δD H 2 O values (−104 to −90‰, −126 to −86‰, and −130 to −106‰, respectively). This indicates that the fluid source gradually evolved from magmatic to meteoric. δ 34 S values of the hydrothermal pyrites (−3.0 to 0.0‰; avg. −1.1‰) resemble those of typical magmatic/mantle-derived sulfides. Pyrite Pb isotopic ) are similar to those of the (sub)volcanic ore host, indicating that the origin of ore-forming material was mainly the upper crustal (sub)volcanic rocks. Integrating evidence from geology, FIs, and H-O-S-Pb isotopes, we suggest that Xiuwenghala is best classified as a low-sulfidation epithermal gold deposit.

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Zircon U–Pb and molybdenite Re–Os geochronology, Hf isotope analyses, and whole-rock geochemistry of the Donggebi Mo deposit, eastern Tianshan, Northwest China, and their geological significance

Cited by 51 publications

References 62 publications

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Crustal evolution in the South Tianshan Terrane: Constraints from detrital zircon geochronology and implications for continental growth in the Central Asian Orogenic Belt

Petrogenesis of rhyolite at Kalatage in the Eastern Tianshan, Northwest China: Evidences from geochemistry, zircon U–Pb geochronology, and Hf isotopes

Genesis of the Xiuwenghala Gold Deposit in the Beishan Orogen, Northwest China: Evidence from Geology, Fluid Inclusion, and H–O–S–Pb Isotopes

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