M.J. Xu’s scientific contributions

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Publications (4)


Zhangguangcailing "neoproterozoic" side slope formation age groups: From magmatic zircons and detrital zircon U-Pb age constraints
  • Article
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January 2014

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100 Reads

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12 Citations

Acta Petrologica Sinica

W.L. Hao

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In this paper, we present the U-Pb age of detrial and magmatic zircons from the sedimentary and volcanic rocks within the "Neoproterozoic" Yimianpo Group in Heilongjiang Province, NE China, combined with the age of the overlying rhyolite from the Taiantun Formation, to constrain the formation time and tectonic nature of the Yimianpo Group. The Yimianpo Group, from bottom to top, is subdivided into the Tangjiatun and Yangmugang formations. The Tangjiatun Formation, outcropped in Shangzhi region, is composed mainly of the meta-intermediate-acidic volcanic rocks (including rhyolite, intermediate-acidic tuff, and minor andesite) in the lower part and feldspar quartz sandstone as well as minor phyllite in the upper part. The Yangmugang Formation consists mainly of sandstone, siltstone, and slate in the lower part and thin layer of sandstone, slate, carbonaceous slate, and silty mudstone in the upper part. The Taiantun Formation, unconformably covering the Yangmugang Formation, is composed mainly of rhyolite and intermediate-acidic tuff. The majorities of the zircons from three samples collected from the Yimianpo Group are euhedral-subhedral in shape and display oscillatory growth zoning or striped absorption in cathodoluminescence (CL) images. Combined with their Th/U ratios (0. 30 ∼ 2. 57), it is suggested that these zircons crystallised from a magma. The dating results indicate: (1) that the 206Pb/238 U ages of 16 analytical spots of zircons from a rhyolite (sample 11HSZ4-1) in the lower part of the Tangjiatun Formation range from 289 Ma to 302Ma, yielding two groups of Concordia ages: 295 ± 2 Ma (mean square weighted deviation (MSWD) =1.08, n = 15) and 428 ±4Ma (n = 1), the former represents the formation time of the rhyolite, the latter is the age of a captured zircon; (2) that the 206Pb/238 U ages from 72 analytical spots on zircons from sample HSZ5-1 (a feldspar quartz sandstone) yield six groups of concordant ages: 234 ± 3Ma (MSWD = 1.2, n = 12), 260 ±2Ma (MSWD =0. 2, n = 12), 273 ±3Ma (MSWD =0. 03, n =6), 291 ± IMa (MSWD =0.49, n=35), 309 ±8Ma (MSWD =0.01, n=2) and 327 ±4Ma (MSWD=0.37, n=5), suggesting that the deposition of its protolith began after ∼234Ma; (3) that the 206 Pb/238U ages from 23 analytical spots on zircons from sample 11HSZ2-1 (a silty mudstone) in the Yangmugang Formation yield age populations of 226 ±4 Ma (n = 1), 267 ± 3 Ma (MSWD = 1.7, n = 15), 362 ± 7 Ma (MSWD = 1. 05, n =3), 411 ±6Ma (n = 1), 485 ± 12Ma (MSWD =0. 01, n =2), and 783Ma (n = 1), implying that it was deposited after 226Ma; and (4) that the 206Pb/238 U ages from 23 analytical spots on zircons from a overlying rhyolite (sample 11HSZ3-4) in the Taiantun Formation range from 185Ma to 193Ma, yielding a weighted mean 206Pb/238 U age of 189 ± IMa (MSWD = 1.5, n = 23), i. e., Early Jurassic, which is interpreted as the formation age of the rhyolite. Based on the dating results of magmatic zircons and detrital zircons and field covering relationship, we conclude that the rhyolites from the Tangjiatun Formation in the Yimianpo Group formed in the Early Permian, rather than Neoproterozoic as previously believed, while the feldspar quartz sandstone from the upper part of the Tangjiatun Formation should be classified to the Yangmugang Formation in age, and that the silty mudstone from the Yangmugang Formation, together with the feldspar quartz sandstone from the upper part of the Tangjiatun Formation, deposited between 226 ∼ 232Ma and 189 ±1Ma, i. e., Late Triassic-Early Jurassic, rather than Neoproterozoic as previously believed. Based on the similarity of age populations of detrital zircons with ones of the outcropped terranes in the study area, it is suggested that the sediments of the Yangmugang Formation in the Yimianpo Group mainly sourced from the Late Paleozoic terranes and minor Early Mesozoic, Early Paleozoic and Neoproterozoic terranes in the adjacent regions. Additionally, the Early Permian rhyolites in the Tangjiatun Formation, together with the coeval basaltic rocks and gabbros in the adjacent regions, constitute a typical bimodal volcanic rock association, implying an extensional environment.

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Geochronology and geochemistry of the Early Jurassic granitoids in the central Lesser Xing'an Range, NE China and its tectonic implications

February 2013

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249 Reads

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68 Citations

Acta Petrologica Sinica

LA-ICP-MS zircon U-Pb dating and geochemical data are reported for three granites and one biotite monzonite in the central Lesser Xing'an Range in order to constrain its formation time, petrogenesis and the regional tectonic setting. Zircons from four representative intrusive rocks are euhedral-subhedral in shape and display oscillatory growth zoning in CL images, implying their magmatic origin. The dating results indicate that the granites and biotite monzonite from the northwestern Lesser Xing'an Range formed in the Early Jurassic (175∼185Ma). The granitoids have SiO2 =67.32%∼75.61%, Al2O3 =12.76%∼16.71%, Na 2O+K208.07%∼10. 40%, Na2O/K2O = 0.94∼1.67, A/CNK = 0.91 ∼ 1.06, A/NK = 1.09 ∼ 1.27, and belong chemically to high-potassium calc-alkaline I-type ones. Moreover, these granitoids are enriched in light rare earth elements (LREEs) and large ion lithophile elements (LILEs), and depleted in heavy rare earth elements (HREEs) and high field strength elements (HFSEs). Their zircon εHf(183 ∼ 185Ma) values range from +6. 3 to + 10. 8, and Hf two-stage model ages vary from 754Ma to 1092Ma, implying that their primary magmas were derived from partial melting of the juvenile lower crust. The Early Jurassic granitoids, together with coeval mafic-ultramafic intrusive rocks in the Lesser Xing'an-Zhangguangcai Range, constitute a typical bimodal igneous rock association, suggesting an extensional environment. Combined with the spatial compositional variation of the Early Jurassic igneous rocks in NE China, it is suggested that the Early Jurassic granitoids from the Lesser Xing'an Range formed under an extensional environment similar to back-arc basin which could be related to double-subductions of the Paleo-Pacific plate beneath the Eurasian continent and the Mongol-Okhotsk oceanic plate beneath the Erguna Massif.


Mesozoic tectonic regimes and regional ore-forming background in NE China: Constraints from spatial and temporal variations of Mesozoic volcanic rock associations. Acta Petrologica Sinica, 29(2):

February 2013

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435 Reads

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274 Citations

Acta Petrologica Sinica

This paper summarizes geochronology and association of Mesozoic volcanic rocks and their spatial and temporal variations, with the aim of constraining evolutionary history, and ore-forming background of the circum Pacific and Mongol-Okhotsk tectonic systems in NE China. Zircon U-Pb dating results indicate that Mesozoic volcanisms in NE China can be subdivided into six stages, i. e., Late Triassic (200 ∼ 228Ma), Early-Middle Jurassic (173 ∼ 190Ma), Middle-Late Jurassic (158 ∼ 166Ma), early Early Cretaceous (138 ∼ 145Ma), late Early Cretaceous (106 ∼ 133Ma), and Late Cretaceous (88 ∼ 97Ma). Late Triassic volcanic rocks in NE China mainly distribute in the eastern Jilin-Heilongjiang provinces and the Lesser Xing'an-Zhangguangcai Ranges. The former consists of A-type rhyolite, the latter is composed of bimodal volcanic rocks, implying that they formed under an extensional environment after the final closure of the Paleo-Asian Ocean. Early-Middle Jurassic volcanic rocks occur in the eastern Jilin-Heilongjiang provinces, the Lesser Xing'an-Zhangguangcai Ranges, and the Erguna district. Those in the eastern Jilin-Heilongjiang provinces and the Erguna district are composed of calc-alkaline volcanic rocks, suggesting that they formed under the subductions of the Paleo-Pacific plate beneath the Eurasian continent and of the Mongol-Okhotsk oceanic plate beneath the Erguna Massif, respectively. However, those in the Lesser Xing'an-Zhangguangcai Ranges are a set of bimodal volcanic rocks, implying that they formed under an extensional environment similar to a back-arc setting of double-direction subduction. Middle-Late Jurassic and early Early Cretaceous volcanic rocks only distribute to the west of the Songliao basin, including the Great Xing'an Range and northern Hebei-western Liaoning provinces. Middle-Late Jurassic volcanic rocks consist of basaltic trachy-andesite, trachy-andesite, and trachyte, whereas early Early Cretaceous volcanic rocks are composed of A-type rhyolite and alkali rhyolite, which formed under an extensional environment related to the collapse or delamination of the thickened lower crust. The late Early Cretaceous volcanic rocks are widespread in NE China, those in the eastern Jilin-Heilongjiang provinces belong chemically to a set of calc-alkaline series, whereas those from the Songliao basin and the Great Xing'an Range are a bimodal volcanic rocks. The former marks the subduction of the Paleo-Pacific plate beneath the Eurasian continent, the latter could form under an extensional environment related to the delamination of the thickened lower crust and/or a back-arc setting. Late Cretaceous volcanic rocks mainly occur in the eastern margin of the Eurasian continent, and consist of calc-alkaline series in the continental margin and alkali basalts in intracontinent, suggesting that they formed under the subduction of the Paleo-Pacific plate. Taken together, we conclude: 1) that the subduction of the circum Pacific tectonic system beneath the Eurasian continent began in the Early Jurassic and took place in three times (Early Jurassic, late Early Cretaceous, and Late Cretaceous) during Mesozoic; the influencing spatial extent of the circum Pacific tectonic system mainly include the Songliao basin and its to east; the active continental margin and Paleo-subduction zone are favorable sites in search of porphyry ore deposits, whereas an extensional regions within intracontinent are favorable for the formation of the epithermal hydrothermal ore deposits in the eastern Jilin-Heilongjiang provinces; 2) that the Mongol-Okhotsk tectonic system experienced Early Mesozoic subduction beneath the Erguna Massif, and Middle Jurassic and early Early Cretaceous thrusting events; the influencing spatial extent of the Mongol-Okhotsk tectonic system include to west of the Songliao basin and northern margin of the North China Craton; the Early Mesozoic subduction of the Mongol-Okhotsk oceanic plate beneath the Erguna Massif is favorable for the formation of porphyry deposits, whereas the extensional environment related to the collapse or delamination of the thickened lower crust in Late Jurassic and Early Cretaceous are favorable for formation of polymetallic deposits.


LA-ICP-MS zircon U-Pb chronology and geochemistry of Mesozoic volcanic rocks from the Shanghulin-Xiangyang basin in Ergun area, northeastern Inner Mongolia

September 2011

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39 Reads

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65 Citations

Geological Bulletin of China

LA-ICP-MS zircon U-Pb dating results indicate that the Mesozoic volcanic rocks in the study area can be divided into two stages, i.e., early Early Cretaceous (~144 Ma) and late Early Cretaceous (~125 Ma). The early Early Cretaceous volcanic rocks, represented by the rhyolites from the Jixiangfeng Formation, have high SiO2 and alkali content (especially K2O, with K2O/Na2O ratios higher than 1), and are enriched in light rare earth elements (LREEs), Rb, Th, U, and relatively depleted in heavy rare earth elements (HREEs) and such high field strength elements as Nb, Ta and Ti, as well as Sr and P, similar chemically to A-type rhyolites, suggesting that they might have been formed in an extensional setting. The late Early Cretaceous volcanic rocks display a bimodal volcanic rock association. The basaltic rocks are characterized by high alkali (especially K2O) content, enrichment of LREEs, Rb and Ba, relative depletion of HREEs and HFSEs such as Nb, Ta, Ti and Y, belonging chemically to the shoshonitic series, whereas the rhyolitic rocks are similar to the A-type rhyolites. The bimodal volcanic rocks were probably formed in an extensional setting. Combined with spatial and temporal distribution of the Mesozoic volcanic rocks in Northeast China, it is suggested that the formation of the early Early Cretaceous volcanic rocks might have been related to the evolution of the Mongolia-Okhotsk orogen, whereas the formation of the late Early Cretaceous bimodal volcanic rocks might be attributed to subduction of the Paleo-Pacific plate (Izanagi) beneath the Eurasian continent.

Citations (4)


... 280 Ma (Fig. 7a, b), respectively. These ages are similar to the ages of Early Permian bimodal volcanic rocks in the area between the Lesser Xing'an Range and Zhangguangcai Range, as well as Early Permian igneous rocks distributed along both sides of the Mudanjiang Fault Zone (Wu et al., 2001;Meng et al., 2011;Yu et al., 2013;Hao et al., 2014;Yang et al., 2015Yang et al., , 2017bDong et al., 2017aDong et al., , 2017bDong et al., , 2017c. Representative rocks from Wang, 2013;Hao et al., 2014;Yan et al., 2016;Zhong et al., 2018), and the Proterozoic rocks in the western Jiamusi block (d; after . ...

Reference:

Provenance and tectonic setting of the Yimianpo Group in the southeastern Songnen–Zhangguangcai Range Block: constraints on the closure of the Mudanjiang Ocean
Zhangguangcailing "neoproterozoic" side slope formation age groups: From magmatic zircons and detrital zircon U-Pb age constraints

Acta Petrologica Sinica

... The widespread Jurassic accretionary complexes along the eastern margin of the Asian continent, together with an Early Jurassic N-S-trending magmatic arc and coeval mafic intrusions, I-type granitoids, and silicic lavas, which are subparallel to the Heilongjiang complex suggested that the Paleo-Pacific Plate was subducted beneath this margin in the Early Jurassic, and the following continuous subduction during the Jurassic, which resulted in crustal shortening and thickening, and widespread magmatism in NE China [30,73,74]. However, this mechanism cannot explain the Late Jurassic extension in the Great Xing'an Range, because Late Jurassic igneous rocks in NE China are comparatively rare in the Xing'an-Zhangguangcai ranges and the eastern parts of Jilin provinces and Heilongjiang [16], mainly within the Great Xing'an Range [75][76][77][78], which means that there was no subduction around the Pacific Ocean in Late Jurassic and precludes a relationship between the Jurassic igneous rocks and subduction of the Paleo-Pacific Plate. ...

LA-ICP-MS zircon U-Pb chronology and geochemistry of Mesozoic volcanic rocks from the Shanghulin-Xiangyang basin in Ergun area, northeastern Inner Mongolia
  • Citing Article
  • September 2011

Geological Bulletin of China

... The extrusive basic to acidic volcanic rocks with ages between 130 and 100 Ma are the products of Cretaceous magmatism in a continental margin environment (Xu et al., 2013). Several small porphyritic granodiorite stocks of ca. ...

Mesozoic tectonic regimes and regional ore-forming background in NE China: Constraints from spatial and temporal variations of Mesozoic volcanic rock associations. Acta Petrologica Sinica, 29(2):

Acta Petrologica Sinica

... During the Mesozoic, key events included the tectonic changes related to the Mongol-Okhotsk Ocean and the Pacific Plate's subduction, followed by deep faulting in the Cenozoic 21 . These multiple tectonic and magmatic activities have resulted in a diverse geological profile, including Paleozoic volcanic and metamorphic rocks, Mesozoic continental volcanic rocks, Paleogene fluvial-lacustrine sedimentary rocks, and Phanerozoic granites 22,23 . This region of Northeast China is renowned for its intense and intricate tectonic and magmatic history. ...

Geochronology and geochemistry of the Early Jurassic granitoids in the central Lesser Xing'an Range, NE China and its tectonic implications

Acta Petrologica Sinica