Early Mesozoic tectonic transition of the eastern South China Block: constraints from Late Triassic Dashuang complex in eastern Zhejiang Province

2018 ◽  
Vol 61 (8) ◽  
pp. 997-1015 ◽  
Author(s):  
Xianbing Xu ◽  
Qiming Li ◽  
Lin Gui ◽  
Yuping Su ◽  
Xuefen Zhang
Keyword(s):  
South China ◽  
Zhejiang Province ◽  
Late Triassic ◽  
South China Block ◽  
Tectonic Transition ◽  
Early Mesozoic

Reappraisal of the Mesozoic tectonic transition from the Paleo-Tethyan to Paleo-Pacific domains in South China

2021 ◽  
Author(s):  
Chengshi Gan ◽  
Yuzhi Zhang ◽  
Yuejun Wang ◽  
Xin Qian ◽  
Yang Wang
Keyword(s):  
South China ◽  
Middle Jurassic ◽  
Late Jurassic ◽  
Sedimentary Rocks ◽  
Early Jurassic ◽  
Igneous Rocks ◽  
Late Triassic ◽  
Geochemical Data ◽  
South China Block ◽  
Tectonic Transition

The southeastern (SE) South China Block was mainly influenced by the Paleo-Tethyan and Paleo-Pacific dynamic domains during the Mesozoic. The initial timing of the tectonic transition between these two domains in the SE South China Block still remains debated. The transition would affect the nature of the lithosphere and material provenance of sediments, and, therefore, igneous and sedimentary rocks in the area could record such dynamic processes. In this study, published geochronological and geochemical data of the Triassic and Jurassic igneous rocks and detrital zircon data of contemporaneous sedimentary rocks in the SE South China Block were compiled, aiming to provide constraints on the tectonic transition via tracing the spatial-temporal variations in the nature of the lithosphere and sedimentary provenance signals. The compiled results suggest that the magmatic intensity and volume decreased significantly from the Late Triassic to Early−Middle Jurassic, with an obvious magmatic quiescence between them, and increased from the Early−Middle Jurassic to Late Jurassic. The εNd(t) and zircon εHf(t) values of mafic rocks, granitoids, and shoshonitic rocks remarkably increased from the Late Triassic to Early−Middle Jurassic, indicative of variations in the lithospheric mantle and continental crust. Such variations suggest that the initial tectonic transition occurred at the earliest Early Jurassic. Based on the southward paleocurrents from Early Jurassic sandstone, E-W−trending extension of Early−Middle Jurassic mafic and shoshonitic rocks, and similar sedimentary provenances of Late Triassic and Early−Middle Jurassic sedimentary rocks, these features imply that the SE South China Block was not immediately influenced by the Paleo-Pacific domain during the Early−Middle Jurassic. However, from the Early−Middle Jurassic to Late Jurassic and Early Cretaceous, the spatial distribution, geochemical signatures, magmatic intensity, and magmatic volume of igneous rocks and provenance of sedimentary rocks exhibit obvious variations, and the regional fold hinge direction changed from E-W−trending to NE-trending, suggesting significant effects from Paleo-Pacific subduction on the SE South China Block. Thus, the Mesozoic tectonic transition from the Paleo-Tethyan to the Paleo-Pacific dynamic domain in the SE South China Block likely occurred during the Early−Middle Jurassic.

Detrital zircon U–Pb dating of Late Triassic Wenbinshan Formation in southwestern Fujian, South China, and its geological significance

2018 ◽  
Vol 55 (8) ◽  
pp. 980-996 ◽  
Author(s):  
Zhongjie Xu ◽  
Yizhi Lan ◽  
Jintao Kong ◽  
Rihui Cheng ◽  
Liaoliang Wang
Keyword(s):  
South China ◽  
Detrital Zircon ◽  
Coastal Areas ◽  
Late Triassic ◽  
Late Paleozoic ◽  
Age Composition ◽  
Zircon Age ◽  
Early Mesozoic ◽  
Similarities And Differences ◽  
Southwestern Fujian

Based on research of the petrology, geochemistry, and zircon U–Pb dating of detrital rocks in the Late Triassic Wenbinshan Formation in southwestern Fujian, and comparing the detrital zircon ages of Wenbinshan Formation with those of Late Paleozoic – Early Mesozoic main basins in South China, the sedimentary provenance of the Late Triassic in southwestern Fujian and its implications for changes in basin properties are discussed. The research results demonstrate that there is a major age peak at 222 Ma, two subordinate age peaks at 275 Ma and 1851 Ma, and two minor age peaks at 413 Ma and 2447 Ma in the detrital zircon age spectra of the upper samples (YGP–6) of the Wenbinshan Formation, whereas there are two major age peaks at 229 Ma and 1817 Ma and other minor age peaks 265 Ma 309 Ma, 415 Ma, 1968 Ma, and 2435 Ma in the detrital zircon age spectra of the lower samples (YGP–26) of the Wenbinshan Formation. The upper samples contain fewer old detrital zircons than the lower samples, but the upper and lower samples of Wenbinshan Formation are similar in major age composition, which indicates the main provenances of the upper and lower sediments are very similar. The source rocks are mainly sedimentary rocks and their provenances are derived from a source area of recycled orogenic belt and volcanic arc orogenic belt (acidic island arc). The detrital zircon composition of the Wenbinshan Formation is mainly composed of Paleoproterozoic zircon and Late Paleozoic – Early Mesozoic zircon. In the Paleoproterozoic, sedimentary provenances were mainly derived from the Wuyi Massif and partly from northwestern Fujian-southwestern Zhejiang. As for the period of Late Paleozoic – Early Mesozoic, the provenances of the Wenbinshan Formation were derived from magmatic active belts of the Early Indosinian Epoch of northern South China, eastern South China, and the Indosinian Period of northern South China and coastal areas of eastern South China. The similarities and differences between detrital zircon age peaks of the Wenbinshan Formation in southwestern Fujian and that of the main basins in South China during the period of Late Paleozoic – Early Mesozoic indicate that from eastern coastal areas of South China to the north and interior of South China, the age composition of basin sediments has changed from simple to relatively complex, and from young sediments to older sediments. There are similarities and differences in the detrital zircon compositions of the different basins, which can indicate differences in the nature of the basins.

The kinematics of the Tan-Lu Fault zone during the Mesozoic-Palaeocene and its relations with the North China – South China block collision (Anhui Province, China)

2007 ◽  
Vol 178 (5) ◽  
pp. 353-365 ◽  
Author(s):  
Pierre Vergely ◽  
Ming Jin Hou ◽  
Young Ming Wang ◽  
Jacques-Louis Mercier
Keyword(s):  
Continental Crust ◽  
Fault Zone ◽  
South China ◽  
North China ◽  
Sedimentary Cover ◽  
Eastern China ◽  
Strike Slip ◽  
Late Triassic ◽  
South China Block ◽  
The North

Abstract The Tan-Lu Fault zone (TLFZ), often considered as a major sinistral strike-slip fault, extends in a NE to NNE direction for more than 2,000 km in eastern China. A structural analysis of the southern segment of the TLFZ (STLFZ) and surrounding areas enables us to propose the following evolution of this area during the Mesozoic-Palaeocene. The mid-Triassic NNW-SSE and late Triassic SSW-NNE to SSE-NNW strikes of the stretching lineations in the Zhangbaling massif favour ductile shears in a Zhangbaling metamorphic formation located along a ~NNE-SSW orientated “Tan-Lu margin”; this margin connected two margin segments situated north of the Dabie and Sulu belts. During the Mid-Late Triassic, the continental crust of the South China block (SCB) has been obliquely subducted along this margin below the North China block (NCB). We confirm that the SCB continental crust has been sliced and thrust toward the SSE and propose that the ductile thrusts have merged into the decollements of the sedimentary cover of the platform, forming the thrust-and-fold belt which has acted as a sinistral compressional transfer zone between the Dabie and Sulu collision belts. Thrusting and folding, under a N to NNE compression, affecting Jurassic deposits north and south of the Dabie Shan, indicate that the SCB/NCB collision has continued during the Jurassic. We show that a strike-slip tectonic regime occurred at that time, east of the STLFZ, which initiated as a sinistral continental transform fault between the Dabie and Sulu collisional belts. Dikes and strike-slip faults confirm that a ~NW-SE stretching was active during the basal early Cretaceous (~135–130 Ma), in and around metamorphic domes intruded by plutons. We show that strike-slip faulting, under a NW-SE compression-NE-SW tension, has been active subsequently, until the Aptian-? Early Albian (110/105 Ma), possibly until the Cenomanian (~95 Ma); at that time, the TLFZ has acted as a sinistral continental trans-current fault zone in eastern Asia. Subsequently, normal faulting, under a WNW-ESE extension, indicates that the TLFZ has been a normal fault zone during the Campanian-Palaeocene (~83–55 Ma), possibly until the Early Ypresian (~50 Ma). Sinistral offsets, in the order of several 100 of kilometres, on both sides of the TLFZ have been proposed; the present study does not support such large offset magnitudes.

XKS splitting-based upper-mantle deformation in the Jiaodong Peninsula records the boundary between the North China Craton and South China Block

2020 ◽  
Vol 222 (2) ◽  
pp. 956-964
Author(s):  
Chenglong Wu ◽  
Tao Xu ◽  
Yinshuang Ai ◽  
Weiyu Dong ◽  
Long Li
Keyword(s):  
South China ◽  
North China Craton ◽  
North China ◽  
Pacific Plate ◽  
Late Triassic ◽  
South China Block ◽  
The North ◽  
Jiaodong Peninsula ◽  
Pacific Plate Subduction ◽  
Plate Subduction

SUMMARY The Jiaodong Peninsula consists of the Jiaobei massif and the Northern Sulu UHP massif. These are separated by the Wulian suture zone (WSZ), a key region for understanding the collision between the North China Craton (NCC) and South China Block (SCB). To interpret this collisional zone, a broad-band seismic profile of 20 stations was installed across the WSZ. Shear wave splitting analysis of teleseismic data revealed a contrast in the splitting patterns beneath different structural zones of the Jiaodong Peninsula. The anisotropic structures of the Jiaobei massif and Northern Sulu UHP massif can be explained by a single anisotropic layer model with WNW-ESE or E-W oriented fast directions. In the WSZ, splitting parameters exhibit pronounced variation in backazimuths indicating a two-layer anisotropy pattern. The lower layer exhibits a WNW-ESE fast direction consistent with that observed in the other two regions. Because the fast direction is generally parallel to the present-day direction of Pacific plate subduction, the anisotropy most likely represents asthenospheric return flow in the big mantle wedge caused by Pacific plate subduction. The upper layer exhibits an NE fast direction, that is, parallel to faulting associated with the WSZ. The lithosphere may preserve fossilized anisotropy induced by the Late Triassic collision of the NCC and SCB even after subsequent destruction and thinning from the Late Mesozoic to Cenozoic. We infer that the WSZ represents a lithospheric-scale structural boundary between the NCC and SCB.

scholarly journals Supplemental Material: Reappraisal of the Mesozoic tectonic transition from the Paleo-Tethyan to Paleo-Pacific domains in South China

2021 ◽  
Author(s):  
Chengshi Gan ◽  
Yuzhi Zhang ◽  
et al.
Keyword(s):  
South China ◽  
High Field ◽  
South China Block ◽  
Loss On Ignition ◽  
High Field Strength ◽  
Nd Isotope ◽  
Mafic Rocks ◽  
Tectonic Transition ◽  
Major Oxide ◽  
Block Figure

Synthesis of the formation ages of the Triassic and Jurassic mafic rocks, shoshonitic rocks and granitoids in the Southeastern South China Block; Table S2: Major oxide (wt%) and trace element (ppm) compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S3: Sr-Nd isotope compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S4: Zircon Hf isotope compositions for the Triassic and Jurassic mafic and shoshonitic rocks and granitoids in the Southeastern South China Block; Figure S1: (A) Ta/Yb-Ce/Yb diagram for the Triassic and Jurassic shoshonitic rocks and (B) SiO2-MgO diagram for the Jurassic high-Mg andesite in the Southeastern South China Block; Figure S2: The variations of high field strength elements (HFSE) with loss on ignition (LOI) for the Jurassic mafic rocks in the Southeastern South China Block.<br>

Supplemental Material: Reappraisal of the Mesozoic tectonic transition from the Paleo-Tethyan to Paleo-Pacific domains in South China

2021 ◽  
Author(s):  
Chengshi Gan ◽  
Yuzhi Zhang ◽  
et al.
Keyword(s):  
South China ◽  
High Field ◽  
South China Block ◽  
Loss On Ignition ◽  
High Field Strength ◽  
Nd Isotope ◽  
Mafic Rocks ◽  
Tectonic Transition ◽  
Major Oxide ◽  
Block Figure

Synthesis of the formation ages of the Triassic and Jurassic mafic rocks, shoshonitic rocks and granitoids in the Southeastern South China Block; Table S2: Major oxide (wt%) and trace element (ppm) compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S3: Sr-Nd isotope compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S4: Zircon Hf isotope compositions for the Triassic and Jurassic mafic and shoshonitic rocks and granitoids in the Southeastern South China Block; Figure S1: (A) Ta/Yb-Ce/Yb diagram for the Triassic and Jurassic shoshonitic rocks and (B) SiO2-MgO diagram for the Jurassic high-Mg andesite in the Southeastern South China Block; Figure S2: The variations of high field strength elements (HFSE) with loss on ignition (LOI) for the Jurassic mafic rocks in the Southeastern South China Block.<br>

Tectonic evolution of the Paleo-Tethys Ocean in Southwest Guangxi: evidence from acidic magmatic rocks in the Pingxiang area, SW China

2021 ◽  
Author(s):  
Wenmin Huang ◽  
Xijun Liu ◽  
Zhenglin Li ◽  
Bing Zhao ◽  
Yiying Han
Keyword(s):  
Partial Melting ◽  
South China ◽  
South China Block ◽  
Guangxi Province ◽  
The South ◽  
Crustal Rocks ◽  
The North ◽  
Early Mesozoic ◽  
Innovation Project ◽  
Tethys Ocean

&lt;p&gt;Early Mesozoic development of Southeast Asia involved oceanic subduction, closure, accretion and collision of discrete terranes rifted from Gondwana. South China, as an important continental terrane, is bound to the north by the Qinling-Dabie collisional orogenic belt, to the south by the Indochina Block, and to the east by the Pacific Plate. The role of continental collision and subduction during the Early Mesozoic development of South China has sparked the interest of geologists worldwide and stimulated considerable research. The Triassic tectonic history of the southwestern South China Block is marked by the Indosinian orogeny that records amalgamation of the Indochina and South China blocks during the late Permian to Triassic as a result of closure of the eastern branch of the Paleo-Tethys Ocean. In South China, there is widespread granitic magmatism, metamorphism and deformation. The closure of eastern Paleo-Tethys Ocean and subsequent collision between the South China block and Indochina Block has caused the collision zone metamorphism and formation of granites during the Permo-Triassic, with the Song Ma fault zone as the collision boundary. The Indosinian magmatism in the Pingxiang region was the magmatic products in this period. We report the new results of bulk-rock major and trace element, Nd, Hf isotopic compositions and zircon U&amp;#8211;Pb dating of granites and rhyolites in the Pingxiang region in Guangxi Province, Southwest China, to decipher their petrogenesis and tectonic settings. The granites and rhyolitics in the Pingxiang area have low Mg&lt;sup&gt;#&lt;/sup&gt; values (11.1&amp;#8211;36.7), low Nb/Ta ratios (9.26&amp;#8211;13.74) exhibiting a both affinity from S-type to I-type granaite. The isotopic features of these rocks show negative &amp;#949;&lt;sub&gt;Hf&lt;/sub&gt;(t) with the values ranging from -9.89 to -6.09, negative &amp;#949;&lt;sub&gt;Nd&lt;/sub&gt;(t) values ranging from -12.89 to -12.02 and T&lt;sub&gt;2DM&lt;/sub&gt; values of 1.8&amp;#8211;3.3 Ga, suggesting that the Pingxiang granites and rhyolites was derived from partial melting of paleoproterozoic crust rocks. The granites yielded &lt;sup&gt;206&lt;/sup&gt;Pb/&lt;sup&gt;238&lt;/sup&gt;U ages ranging from 243 to 241 Ma, and the rhyolites yielded &lt;sup&gt;206&lt;/sup&gt;Pb/&lt;sup&gt;238&lt;/sup&gt;U ages ranging from 247 to 245 Ma, which are both within the age range of the subduction to collision. Combine the regional geology, we suggest these granitoids and rhyolites were formed by the partial melting of crustal rocks during a transition from subduction to post-collisional environment with closure of Paleo-Tethys Ocean between the South China block and Indochina Block.&lt;/p&gt;&lt;p&gt;This study was financially supported by Guangxi Natural Science Foundation for Distinguished Young Scholars (2018GXNSFFA281009) and the Fifth Bagui Scholar Innovation Project of Guangxi Province (to XU Ji-feng).&lt;/p&gt;

scholarly journals Supplemental Material: Reappraisal of the Mesozoic tectonic transition from the Paleo-Tethyan to Paleo-Pacific domains in South China

2021 ◽  
Author(s):  
Chengshi Gan ◽  
Yuzhi Zhang ◽  
et al.
Keyword(s):  
South China ◽  
High Field ◽  
South China Block ◽  
Loss On Ignition ◽  
High Field Strength ◽  
Nd Isotope ◽  
Mafic Rocks ◽  
Tectonic Transition ◽  
Major Oxide ◽  
Block Figure

Synthesis of the formation ages of the Triassic and Jurassic mafic rocks, shoshonitic rocks and granitoids in the Southeastern South China Block; Table S2: Major oxide (wt%) and trace element (ppm) compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S3: Sr-Nd isotope compositions for the Triassic and Jurassic mafic rocks, shoshonitic rocks and high-Mg andesite and granitoids in the Southeastern South China Block; Table S4: Zircon Hf isotope compositions for the Triassic and Jurassic mafic and shoshonitic rocks and granitoids in the Southeastern South China Block; Figure S1: (A) Ta/Yb-Ce/Yb diagram for the Triassic and Jurassic shoshonitic rocks and (B) SiO2-MgO diagram for the Jurassic high-Mg andesite in the Southeastern South China Block; Figure S2: The variations of high field strength elements (HFSE) with loss on ignition (LOI) for the Jurassic mafic rocks in the Southeastern South China Block.<br>

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