Geochronological and Geochemical Constraints on the Petrogenesis of Permian Dolerite Dyke Swarms in the Beishan Orogenic Belt, NW China

Extensive Early Permian mafic-ultramafic intrusions, doleritic dykes, and basalts crop out within the Beishan area, southern Central Asian Orogenic Belt (CAOB). We present new geochronological and geochemical data for Gubaoquan dolerite dyke swarms in the Beishan orogenic belt. Zircon U-Pb Dating of the Gubaoquan dykes indicates that they were emplaced during the Early Permian (280.7 ± 4 Ma), that was coeval with Yinaoxia and Podong mafic dykes in Beishan area. The dykes are characterized by low Mg# (47–84) in the clinopyroxene crystals, and the content of whole-rock Fe2O3 (t), MgO, and alkali (Na2O + K2O) range from 12.5–17.4, 4.06–5.51, and 2.8–4.4 wt.%, respectively. The samples from the Gubaoquan dykes have high and variable Ba/La (5.93–14.2) and Ba/Nb (15.0–37.3) ratios but low Th/Yb (0.17–0.24) ratios. The rocks show slightly enrichments in LREE, HFSE, Th, and Hf, and depletion in Nb and Ta. The εNd (t = 280 Ma) values and initial 87Sr/86Sr ratios of the Gubaoquan dykes show variations ranging from 6.4 to 6.8 and 0.706240 to 0.707546, respectively. These data suggest that the parental magmas for the Gubaoquan dykes were probably derived from partially decompressed melting of upwelling depleted asthenosphere mantle that was metasomatized previously by subducted fluids.

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Geology, geochronology, mineral chemistry and geochemistry of the Hongnieshan mafic-ultramafic complex in the Beishan area, southern Central Asian Orogenic Belt, NW China: implications for petrogenesis and regional Ni mineralization

Ore Geology Reviews ◽

10.1016/j.oregeorev.2021.104423 ◽

2021 ◽

pp. 104423

Author(s):

Banxiao Ruan ◽

Wei Wei ◽

Yingmin Yu ◽

Xinbiao Lv

Keyword(s):

Mineral Chemistry ◽

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Nw China ◽

Central Asian ◽

Ultramafic Complex ◽

Southern Central ◽

Beishan Area

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Constraints on the tectonic evolution of the southern central Asian orogenic belt from early Permian–middle Triassic granitoids from the central Dunhuang orogenic belt, NW China

Journal of Asian Earth Sciences ◽

10.1016/j.jseaes.2020.104283 ◽

2020 ◽

Vol 194 ◽

pp. 104283 ◽

Cited By ~ 4

Author(s):

Lamei Feng ◽

Shoufa Lin ◽

Longming Li ◽

Donald W. Davis ◽

Chuanzhong Song ◽

...

Keyword(s):

Tectonic Evolution ◽

Middle Triassic ◽

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Early Permian ◽

Nw China ◽

Central Asian ◽

Southern Central

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Late Paleozoic multi-stage subduction accretion of the southwestern Central Asian Orogenic Belt: insights from the Late Carboniferous-Early Permian granites in the southern West Junggar, NW China

International Geology Review ◽

10.1080/00206814.2021.1969526 ◽

2021 ◽

pp. 1-23

Author(s):

Fenghao Duan ◽

Yongjun Li ◽

Qian Zhi

Keyword(s):

Orogenic Belt ◽

Late Carboniferous ◽

Central Asian Orogenic Belt ◽

Late Paleozoic ◽

Early Permian ◽

Nw China ◽

Multi Stage ◽

Central Asian ◽

West Junggar

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Successive arc accretion in the southern Central Asian orogenic belt, NW China: Evidence from two Paleozoic arcs with offset magmatic periods

Geological Society of America Bulletin ◽

10.1130/b31434.1 ◽

2017 ◽

Vol 130 (3-4) ◽

pp. 537-557 ◽

Cited By ~ 2

Author(s):

Nathan R. Cleven ◽

Shoufa Lin ◽

Wenjiao Xiao ◽

Donald W. Davis ◽

Bill Davis

Keyword(s):

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Nw China ◽

Central Asian ◽

Southern Central

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Detrital zircon constraints on late Paleozoic tectonism of the Bogda region (NW China) in the southern Central Asian Orogenic Belt

Geoscience Frontiers ◽

10.1016/j.gsf.2020.04.002 ◽

2020 ◽

Vol 11 (5) ◽

pp. 1533-1548

Author(s):

Qian Wang ◽

Guochun Zhao ◽

Yigui Han ◽

Jinlong Yao

Keyword(s):

Detrital Zircon ◽

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Late Paleozoic ◽

Nw China ◽

Central Asian ◽

Southern Central

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Late Paleozoic mafic–ultramafic intrusions in southern Central Asian Orogenic Belt (NW China): Insight into magmatic Ni–Cu sulfide mineralization in orogenic setting

Ore Geology Reviews ◽

10.1016/j.oregeorev.2012.11.007 ◽

2013 ◽

Vol 51 ◽

pp. 57-73 ◽

Cited By ~ 43

Author(s):

Ben-Xun Su ◽

Ke-Zhang Qin ◽

Dong-Mei Tang ◽

Patrick Asamoah Sakyi ◽

Ping-Ping Liu ◽

...

Keyword(s):

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Late Paleozoic ◽

Sulfide Mineralization ◽

Nw China ◽

Central Asian ◽

Southern Central ◽

Insight Into

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U–Pb ages and Hf–O isotopes of zircons from Late Paleozoic mafic–ultramafic units in the southern Central Asian Orogenic Belt: Tectonic implications and evidence for an Early-Permian mantle plume

Gondwana Research ◽

10.1016/j.gr.2010.11.015 ◽

2011 ◽

Vol 20 (2-3) ◽

pp. 516-531 ◽

Cited By ~ 189

Author(s):

Ben-Xun Su ◽

Ke-Zhang Qin ◽

Patrick Asamoah Sakyi ◽

Xian-Hua Li ◽

Yue-Heng Yang ◽

...

Keyword(s):

Mantle Plume ◽

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Late Paleozoic ◽

Early Permian ◽

Tectonic Implications ◽

Central Asian ◽

O Isotopes ◽

Southern Central

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Juvenile hafnium isotopic compositions recording a late Carboniferous−Early Triassic retreating subduction in the southern Central Asian Orogenic Belt: A case study from the southern Alxa

Geological Society of America Bulletin ◽

10.1130/b35991.1 ◽

2021 ◽

Author(s):

Rongguo Zheng ◽

Jinyi Li ◽

Jin Zhang

Keyword(s):

Orogenic Belt ◽

Central Asian Orogenic Belt ◽

Geochemical Data ◽

Early Triassic ◽

Late Permian ◽

Geochemical Composition ◽

Isotopic Compositions ◽

Central Asian ◽

Southern Central ◽

Oceanic Slab

Two successive and parallel magmatic arcs within the southern Alxa provide an ideal area to examine the influence of tectonic switching on temporal and spatial distribution of magmatism within accretionary orogens. This study presents new geochronological and geochemical data for Yingen and Quagu plutons from the southern Alxa, located in the southern Central Asian Orogenic Belt. Late Permian Yingen granitic dikes (ca. 252 Ma) have depleted whole-rock Nd isotopic compositions, high Sr, low Y and Yb, and high Sr/Y ratios, all of which indicate they were generated by the partial melting of subducted young/hot oceanic slab. The Middle Permian (271 Ma) Yingen hosting granites contain elevated contents of Nb and Zr, and have high 10,000 × Ga/Al ratios, suggesting that they resulted from mixing between Neoproterozoic crust-derived felsic magmas and depleted mantle-derived mafic magmas. The Quagu pluton yields ca. 271−262 Ma zircon U-Pb ages and has an adakitic high-Mg diorite-like geochemical composition, suggesting that it originated from interaction between slab-derived melts and overlying peridotite material. Collectively, these data record the subduction of the Enger Us oceanic slab beneath Mesoproterozoic−Neoproterozoic sialic crust, generating a Japan-type arc within the southern Alxa during Middle−Late Permian. Temporal-spatial variations of zircon Hf isotope for plutons suggest tectonic switching from advancing to retreating subduction during Carboniferous−Early Triassic within the southern Alxa. An advancing subduction resulted from the subduction of the Paleo-Asian Ocean, and a retreating subduction was related to plate boundary reorganization during the assembly of Pangea.

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