An early Jurassic dextral strike-slip system in southern South China and its tectonic significance

Cai, Jianjun

doi:10.1016/j.jog.2012.09.003

Cited by 25 publications

(9 citation statements)

References 84 publications

(135 reference statements)

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“…The QHSZ (Figure ) between the terranes is suggested as the Jinningian suture zone [e.g., Wang et al ., ; Mao et al ., ; Yang et al ., ]. The connection of the Guangning‐Bobai (or Chenzhou‐Linwu) fault with the Jiangshan‐Shaoxing fault in general outlines its southeastern border [e.g., Wang et al ., ; Cai , ]. Wang et al .…”

Section: Discussionmentioning

confidence: 99%

“…[] considered the Chenzhou‐Linwu fault as the lithospheric boundary between two terranes, with a change of Moho depth across this fault [e.g., Zhang and Wang , ]. According to Cai [], along the Guangning‐Bobai fault, a NE‐SW trending steeply dipping foliation, a gently plunging lineation, and other shear fabrics developed, which define a NE‐SW trending dextral strike‐slip shearing zone. Ar/Ar ages on muscovites from mylonites further place the time of dextral shearing into Early Jurassic (193–187 Ma).…”

Section: Discussionmentioning

confidence: 99%

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Tracing an Early Jurassic magmatic arc from South to East China Seas

Zhang

et al. 2017

Tectonics

124

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Drilling has revealed suites of magnesian granite and diorite emplaced in Early Jurassic time (198–195 Ma) and an arc‐related low‐temperature (678 to 696°C) magmatism in NE South China Sea. These rocks have 87Sr/86Sri (0.705494 to 0.706623) and εNdt (−0.9 to +2.2) as evidence of evolved mantle‐derived magmas, coupled with enriched fluid‐mobile elements Cs to K and Pb implying involvement of subduction‐zone fluids. Another Early Jurassic granodiorite (zircon U‐Pb 187 Ma) drilled from the SW East China Sea, a magnesian high‐K calc alkaline, is comparably confined to a range of low‐temperature (~675°C) arc‐related granite, characterized by enrichment of fluid‐mobile elements and Nb‐Ta depletion. Its Sr‐Nd isotopes (87Sr/86Sri = 0.705200, εNdt = 1.1) suggest a product of evolved mantle‐derived melts. Together with detrital igneous zircons from Paleocene sequences, these observations reveal an Early Jurassic arc‐related low‐temperature (600 to 740°C) magmatism in the SW East China Sea. These arc‐related granitoids, along with those from SE Taiwan, could define an Early Jurassic NE‐SW trending Dongsha‐Talun‐Yandang magmatic arc zone along the East Asian continental margin paired with Jurassic accretionary complexes from SW Japan, East Taiwan to the West Philippines. This arc‐subduction complex assembly was associated with oblique subduction of the paleo‐Pacific slab beneath Eurasia, presumably responsible for Early Jurassic lithospheric extension in south China block.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Tracing an Early Jurassic magmatic arc from South to East China Seas

Zhang

et al. 2017

Tectonics

124

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“…The Hetai goldfield occurs within a regional first‐order fault zone, called the Guangning–Bobai Fault. The fault zone shows a broad sinuous shape trending NE–SW for more than 500 km with widths of 30–60 km (Figure b; J. X. Cai, ). The general trend in the northern (Guangning and Hetai) and southern (Luchuan and Songwang) segments of the fault zone is N45°E, which mainly consists of several approximately parallel shear zones, while the middle segment (Jinzhu) has a N60–70°E trend.…”

Section: Geological Settingmentioning

confidence: 99%

“…These shear zones are highlighted by the strong ductile shear deformation and mylonitization in a variety of rocks including the Yunlougang granitic pluton (zircon U–Pb: 242–209 Ma; L. Wang et al, ), migmatites (zircon U–Pb: 240 ± 4 Ma; Zhai et al, ), Yunkai Group high‐grade metamorphic rocks and associated Palaeozoic metasedimentary rocks in the Hetai goldfield (B. Y. Zhang & Yu, ), the Napeng granitic pluton in the Jinzhu area (zircon U–Pb: 205 ± 2 Ma; B. X. Peng, Wang, Fan, Peng, & Liang, ), the Yunkai Group in the Hekou area and the Darongshan granitic batholith (zircon U–Pb: 230–260 Ma; C. H. Chen, Hsieh, Lee, & Zhou, ), and Early Palaeozoic metasedimentary rocks in the Bobai area. The Guangning–Bobai shear fault belt, which probably formed during 213–187 Ma, displays dextral strike‐slip features (J. X. Cai, , ; Lin, Wang, & Chen, ; G. L. Zhang et al, ; K. J. Zhang & Cai, ). Mylonitic bands ranging in width from metres to decametres were well developed within these shear zones, and stretching along their strike can reach a few kilometres (Z. Q. Zhong, Zhou, & You, ).…”

Section: Geological Settingmentioning

confidence: 99%

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The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies

et al. 2019

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The Hetai goldfield is one of the largest gold mining districts in the South China Block. A complex paragenesis consists of three mineralization stages: syntectonic metamorphic stage, hydrothermal stage, and supergene stage. The syntectonic metamorphic stage is characterized by banded quartz (Q1) and invisible Au in mylonites. The hydrothermal stage, which is the main gold mineralization stage, can be divided into three substages: an early substage characterized by coarse‐grained quartz (Q2) + pyrite + arsenopyrite + pyrrhotite, an intermediate substage characterized by gray fine‐grained quartz (Q3) + electrum + poly‐sulphides + sericite + chlorite and a late substage with predominate white quartz (Q4) + calcite as well as lesser sulphides. During the supergene stage, malachite, covellite, and limonite were formed. Four types of fluid inclusions (FIs) in these types of quartz were identified: aqueous FIs (type 1), CO2‐bearing aqueous FIs (type 2), CO2‐rich FIs (type 3), and solid‐bearing FIs (type 4). Q1 only contains type 1 FIs; Q2 contains types 2 and 4 FIs; Q3 contains types 2 and 3 FIs; and Q4 only contains type 1 FIs. Microthermometric results show that the homogenization temperatures of fluid inclusions range from 350°C to 400°C for Q1, 250°C to 320°C for Q2, 138°C to 245°C for Q3, and 110°C to 207°C for Q4. Salinities of fluid inclusions range from 3.4 to 5.7 wt.%, 2.6 to 12.9 wt.%, 0.5 to 11.5 wt.%, and 0.2 to 7.3 wt.% for Q1, Q2, Q3, and Q4, respectively. Alteration minerals (sericite and chlorite) from the main mineralization stage have δDH2O‐VSMOW values of −62‰ to −98‰ and calculated δ18OH2O‐VSMOW values of 6.3‰ to 4.4‰. The in situ sulphur isotope analysis of pyrite yields a narrow δ34SCDT range of −1.5‰ to −5.2‰ (average −3.4‰), combined with the Pb isotopic compositions of the sulphides, wall rocks, and Wucun pluton, revealing that the ore‐forming material was mainly derived from magmatic source. The mineralization age (sericite 40Ar/39Ar: 159.3 ± 0.8 Ma) is close to the emplacement age of Wucun biotite monzonitic granite pluton (LA‐ICP‐MS zircon U–Pb age: 158.1 ± 1.9 Ma). These geochemical and geochronological data suggest that the main phase of gold mineralization in the Hetai goldfield is genetically related to the granitic activities in the Late Jurassic rather than the mylonitization event in the Late Triassic to Early Jurassic.

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Co-development of Jurassic I-type and A-type granites in southern Hunan, South China: Dual control by plate subduction and intraplate mantle upwelling

Kong

et al. 2018

Geochemistry

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An early Jurassic dextral strike-slip system in southern South China and its tectonic significance

Cited by 25 publications

References 84 publications

Tracing an Early Jurassic magmatic arc from South to East China Seas

Tracing an Early Jurassic magmatic arc from South to East China Seas

The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies

Co-development of Jurassic I-type and A-type granites in southern Hunan, South China: Dual control by plate subduction and intraplate mantle upwelling

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