Discovery of Middle–Late Devonian and Early Permian magmatic events in East Asia and their implication for the Indosinian orogeny in South China: Insights from the sedimentary record

2019 ◽  
Vol 131 (9-10) ◽  
pp. 1519-1536 ◽  
Author(s):  
Xinchang Zhang ◽  
Yuejun Wang ◽  
Ron Harris ◽  
Yi Yan ◽  
Yi Zheng
Keyword(s):  
East Asia ◽  
South China ◽  
Hainan Island ◽  
Source Rocks ◽  
Sediment Provenance ◽  
Published Data ◽  
Late Devonian ◽  
Early Permian ◽  
Indosinian Orogeny ◽  
T Values

Abstract Whether the driver of the Indosinian orogeny in the South China block was related to the evolution of the Paleotethyan Ocean or the Paleo-Pacific Ocean has been a point of much debate. We applied detrital zircon U-Pb dating to Permian–Triassic sedimentary rocks from South China to trace sediment provenance and to further test these models. Our results, combined with other published data from the Pingxiang, Youjiang, Yong’an, and Yongding Basins, show that 400–350 Ma and 300–260 Ma zircon grains are ubiquitous throughout the entirety of southern South China. This indicates regional magmatic events as potential sources. The discovery of Middle–Late Devonian and Early Permian igneous rocks, tuffs, and volcaniclastic rocks in Southeast Asia and Hainan Island implies the presence of two magmatic events (400–350 Ma and 300–260 Ma) within or beyond the southern margin of South China. This information, together with the mostly negative εHf(t) values of 400–350 Ma and 300–260 Ma zircon grains, arc-like geochemical signatures of the possible source rocks, and the regional geology of East Asia, suggests that they originated from sources related to Paleotethyan and even Proto-Tethyan subduction. Thus, Permian–Triassic sedimentation and the Indosinian orogeny in South China were largely controlled by the evolution of the Tethyan Ocean.

Rifting and subduction records of the Paleo–Tethys in North Laos: Constraints from Late Paleozoic mafic and plagiogranitic magmatism along the Song Ma tectonic zone

2020 ◽  
Vol 133 (1-2) ◽  
pp. 212-232 ◽  
Author(s):  
Yuzhi Zhang ◽  
Xue Yang ◽  
Yuejun Wang ◽  
Xin Qian ◽  
Yukun Wang ◽  
...  
Keyword(s):  
South China ◽  
Southwest China ◽  
Hainan Island ◽  
Suture Zone ◽  
Published Data ◽  
Tectonic Zone ◽  
Group 3 ◽  
Group 2 ◽  
Subduction Setting ◽  
Group 1

Abstract In Southeast Asia, the Jinshajiang–Ailaoshan suture in Southwest China and the Song Ma zone in Vietnam were generally accepted as the amalgamation boundary of the South China and Simao/Indochina blocks. However, the tectonic location of the Paleotethyan suture in North Laos and its tectonic affinity remain ambiguous. To address this issue, we present the geochemical and geochronological data of a set of mafic and plagiogranitic rocks along the Song Ma suture zone in North Laos. Three groups of rocks with distinctive petrological, geochronological, and geochemical signatures were identified. The ca. 370 Ma Group 1 plagioclase amphibolite was preserved as xenoliths in the ca. 260 Ma granitoids. It exhibits a normal mid–oceanic–ridge basalt (N–MORB)-like, multi-elemental pattern with highly positive εNd(t) (+3.3 to +10.7) and εHf(t) (+6.68 to +7.41) values and low δ18O values (5.3‰−5.5‰), that are interpreted as products of the Late Devonian − earliest Carboniferous continental rift setting. The ca. 270 Ma Group 2 gabbro/diabase–diorite exhibits arc-like geochemical affinity with the εNd(t), εHf(t), and δ18O values of –5.85 to –3.76, –3.8 to +3.2, and 6.6‰–7.6‰, respectively. It is derived from the metasomatized wedge. The ca. 260 Ma Group 3 plagiogranite shows Nb-Ta and Ti negative anomalies and positive εNd(t) (+3.21 to +4.21), εHf(t) (+8.4 to +13.6), and δ18O (5.9‰−6.8‰) values, which are indicative of its derivation from mafic oceanic crust in a subduction setting. In combination with the published data, these results support the development of the Carboniferous–Permian Paleotethyan branch in North Laos, which represents the tectonic location of the Song Ma suture zone that spatially connects the Jinshajiang–Ailaoshan suture zone in Southwest China and the Chenxing–Bangxi suture zone in Hainan Island, South China.

Internal versus external locations of the South China Craton within Rodinia during the Cryogenian: Provenance history of the Nanhua Basin

2020 ◽  
Author(s):  
Guangyou Zhu ◽  
Huichuan Liu ◽  
Tingting Zhang ◽  
Weiyan Chen ◽  
Jianwei Xiao ◽  
...  
Keyword(s):  
Mantle Plume ◽  
South China ◽  
Detrital Zircons ◽  
Source Rocks ◽  
Yangtze Block ◽  
The South ◽  
Isotopic Analyses ◽  
South China Craton ◽  
Late Neoproterozoic ◽  
T Values

Contrasting models for internal versus external locations of the South China Craton (SCC) in the supercontinent Rodinia and associated mantle plume or ocean subduction dominated tectonic processes can be resolved by detrital zircon U-Pb dating and Lu-Hf isotopic analyses on the Cryogenian Nanhua Supergroup in the central SCC. Our results show that samples from the lower Liantuo, Tiesi’ao, and Datangpo formations of the Nanhua Supergroup show three age peaks at 2.50 Ga, 2.05 Ga, and 0.85 Ga, and those of the upper Nantuo Formation yield four peaks at 2.50 Ga, 2.05 Ga, 0.85 Ga, and 0.65 Ga. The Archean and Paleoproterozoic (1.80−2.10 Ga) zircons have εHf(t) values of −16.3 to +4.7 and −23.0 to +4.2, and may be sourced from the Kongling and Douling complexes and Paleoproterozoic intrusions in the northern Yangtze Block, respectively. Early Neoproterozoic (0.70−0.96 Ga) zircon grains show variable εHf(t) values of −20.0 to +15.0. In combination with the absence of Mesoproterozoic detrital zircons in the Nanhua Supergroup, huge volumes of Neoproterozoic granitic intrusions in the northern Yangtze Block are the potential sources for the 0.70−0.96 Ga detrital zircons. Only the siltstone of the Nantuo Formation has late Neoproterozoic (0.63−0.69 Ga) detrital zircons with high and positive εHf(t) values (+7.9 to +9.4). Several granitoid intrusions (0.63−0.68 Ga) in the Wudang and Ankang uplift of the South Qinling belt in the northern Yangtze Block provide the late Neoproterozoic detrital zircons of the Nantuo Formation. These provenance analyses of the Nanhua Supergroup indicate an interior source from the SCC, rather than an exterior source from the Laurentia and Australia cratons. The Neoproterozoic rift basins and magmatic rocks in the SCC were produced by secular episodic subductions and back-arc extensions, rather than a Neoproterozoic super-mantle plume. The SCC occupied a peripheral position adjacent to northern India in Rodinia during the Neoproterozoic. These conclusions will promote our understanding of genetic mechanism and distribution prediction of the several Cryogenian−Cambrian black-shale layers and excellent source rocks in the SCC.

Diversity and distribution of fiddler crabs (Brachyura: Ocypodidae: Uca) from China, with new records from Hainan Island in the South China Sea

Zootaxa ◽  
2010 ◽  
Vol 2640 (1) ◽  
pp. 1 ◽  
Author(s):  
HSI-TE SHIH ◽  
PETER K. L. NG ◽  
SHOU-HUA FANG ◽  
BENNY K. K. CHAN ◽  
KINGSLEY J. H. WONG
Keyword(s):  
South China Sea ◽  
Southeast Asia ◽  
East Asia ◽  
South China ◽  
New Record ◽  
New Records ◽  
Fiddler Crab ◽  
East Asian ◽  
Hainan Island ◽  
First Record

The fiddler crab fauna (Brachyura: Ocypodidae: Uca) of China is reviewed. Thirteen species are recognised here, viz. Uca acuta (Stimpson, 1858), U. annulipes (H. Milne Edwards, 1837), U. arcuata (De Haan, 1835), U. borealis Crane, 1975, U. coarctata (H. Milne Edwards, 1852), U. crassipes (Adams & White, 1848), U. dussumieri (H. Milne Edwards, 1852), U. lactea (De Haan, 1835), U. paradussumieri Bott, 1973, U. tetragonon (Herbst, 1790), U. triangularis (A. Milne-Edwards, 1873), U. typhoni Crane, 1975, and U. vocans (Linnaeus, 1758). Two females of U. typhoni collected from southern Hainan Island represent the first record of this species from China and East Asia. Two males of U. tetragonon collected from southern Hainan also represent a new record for China. The Uca fauna of southern Hainan is biogeographically distinct being different from those of northern Hainan and continental China, with U. annulipes, U. tetragonon, U. typhoni, and U. vocans common in Southeast Asia. In addition, continental China also lacks some insular species such as U. coarctata, U. formosensis Rathbun, 1921, U. jocelynae Shih, Naruse & Ng, 2010, U. perplexa (H. Milne Edwards, 1837), and U. tetragonon which are common in the East Asian islands of Taiwan and the Ryukyus.

scholarly journals Rare Earth Element Distributions in Continental Shelf Sediment, Northern South China Sea

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3540
Author(s):  
Qian Ge ◽  
Z. George Xue ◽  
Fengyou Chu
Keyword(s):  
Rare Earth ◽  
South China Sea ◽  
Continental Shelf ◽  
South China ◽  
Northern South China Sea ◽  
Hainan Island ◽  
Sediment Provenance ◽  
Adjacent Area ◽  
China Sea ◽  
Qiongzhou Strait

A total of 388 surface sediment samples taken from the northern South China Sea (SCS) continental shelf were analyzed to characterize the signature of their rare earth elements (REEs). The average REEs concentration was 192.94 μg/g, with a maximum of 349.07 μg/g, and a minimum of 32.97 μg/g. The chondrite-normalized REEs pattern exhibits a remarkably light REEs accumulation, a relatively flat heavy REEs pattern, and a negative Eu anomaly. We subdivided the study area into three zones using the characteristics of REEs and statistical characteristics. Zone I: continental shelf off western Guangdong Province. Here, the sediment provenance is mainly river-derived from the Pearl River, Taiwanese rivers, and those in the adjacent area. Zone II: Qiongzhou Strait and Leizhou Peninsula. Here, the sediment provenance consists of the Qiongzhou Strait and the Hainan Island. Zone III: Hainan Island and SCS slope sediments are dominated. The REEs compositions are mainly controlled by source rock properties, hydrodynamic conditions, and an intensity of chemical weathering. We reconstructed the sediment dispersal and transport route using the REEs compositions, grain size, and other geochemical characteristics throughout the study area.

Frasnian–Tournaisian (Late Devonian to Earliest Carboniferous) lithostratigraphy and biostratigraphy of Hainan Island, South China

2021 ◽  
Author(s):  
Hua‐Zhou Yao ◽  
Ren‐Jie Zhang ◽  
Zhi‐Jun Niu ◽  
Bing Tu ◽  
Zhi‐Hong Wang ◽  
...  
Keyword(s):  
South China ◽  
Hainan Island ◽  
Late Devonian

Late Paleozoic- Early Mesozoic tectonics of Hainan Island: Key to understanding Paleotethyan geology

2020 ◽  
Author(s):  
Huiying He ◽  
Peter Cawood ◽  
Yuejun Wang
Keyword(s):  
South China ◽  
Tectonic Evolution ◽  
Hainan Island ◽  
Igneous Rocks ◽  
Late Paleozoic ◽  
Calc Alkaline ◽  
Early Mesozoic ◽  
History Of ◽  
Back Arc ◽  
T Values

<p>In Southeast Asia, establishing the origin and associated tectonic setting of Late Paleozoic-Early Mesozoic igneous rocks is complicated by structural overprinting and the complex tectonic evolution of the Paleotethyan regime. Hainan Island, located at the south-eastern margin of the Paleotethys, and lacking significant tectonic overprints is a key to understand amalgamation history of the Indochina and South China blocks and to constraining the tectonic evolution of Paleotethys ocean in southeast Asia.</p><p>The Late Paleozoic-Early Mesozoic record of igneous rocks on Hainan Island includes the following. 1) ca. 350 Ma island arc andesites and ca. 330 Ma metabasites, the latter with both MORB- and arc-like geochemical affinities, positive ε<sub>Nd</sub>(t) values of +5.86 – +9.85 and rare inherited zircons with a zircon age of 1400 Ma inferred to be derived from a MORB source with the input of a slab-derived component. Together with the ~350 Ma island arc andesites, the Carboniferous tectonic environment is supposed to be a continental back-arc basin setting. 2) Late Permian gneiss granitoids (272-252 Ma) characterized by a gneissic foliation and calc-alkaline I-type geochemical affinities with negative Nb-Ta and Ti anomalies, related to metasomatized mantle wedge modified by the sediment-derived component in a continental arc setting. 3) ca. 257 Ma arc-like andesites, which further validate a subduction-related setting. 4) Peraluminious Early-Middle Triassic massive granitoids (251–243 Ma) with slightly high A/CNK ratios, δ<sup>18</sup>O values (up to 11.75 ‰) and Sr/Y ratios, inferred to have formed in a compressive regime from a mixed source of greywacke and metabasite. 5) Middle-Late Triassic (242–225 Ma) high-K calc-alkaline granitoids with high zircon temperatures (842–867°C) and geochemical signatures of A-type granites. They show slightly low whole-rock ε<sub>Nd</sub>(t) and zircon ε<sub>Hf</sub>(t) values, suggestive of the derivation from a metabasite–greywacke source in an extensional setting. 6) ca. 240 Ma gabbro-dolerites showing enrichment in LILEs, depletion in HFSEs, negative ε<sub>Nd</sub> (t)-ε<sub>Hf</sub> (t) values (−8.45 to −1.05 and −5.9 to −2.7, respectively) and crustal-like δ<sup>18</sup>O values (7.26–8.70‰), it is implied that the Hainan Island entered into post-collisional environment in response to the asthenosphere upwelling shortly after the closure of back-arc basin.</p><p>Thus, Hainan Island provides a record of Carboniferous back-arc basin opening, followed by an extended Permian–Triassic history of subduction-related consumption leading to orogenic assembly and extensional collapse between the South China and Indochina blocks. Such a tempo-spatial pattern is consistent with that along the Song Ma–Ailaoshan suture zone rather than the magmatic history of eastern South China and indicates that the Paleotethys extended west to at least Hainan Island in the Late Paleozoic-Early Mesozoic.</p>

scholarly journals Initiation of the Indosinian Orogeny in South China: Evidence for a Permian Magmatic Arc on Hainan Island

2006 ◽  
Vol 114 (3) ◽  
pp. 341-353 ◽  
Author(s):  
Xian‐Hua Li ◽  
Zheng‐Xiang Li ◽  
Wu‐Xian Li ◽  
Yuejun Wang
Keyword(s):  
South China ◽  
Hainan Island ◽  
Magmatic Arc ◽  
Indosinian Orogeny

Revision of the genus Theopea Baly (Coleoptera: Chrysomelidae: Galerucinae) of East Asia: species lacking modified clypeus in males and the T. sauteri species group

Zootaxa ◽  
2018 ◽  
Vol 4508 (3) ◽  
pp. 334 ◽  
Author(s):  
CHI-FENG LEE ◽  
JAN BEZDĔK
Keyword(s):  
New Species ◽  
East Asia ◽  
South China ◽  
Hainan Island ◽  
Northeast India ◽  
Species Group ◽  
West China

Theopea Baly, 1864 species lacking a modified clypeus of East Asia are revised. Theopea aureoviridis Chûjô, 1935, T. collaris Kimoto, 1989, and T. sauteri Chûjô, 1935 are redescribed. Theopea coerulea Gressitt & Kimoto, 1963 is removed from synonymy with T. sauteri Chûjô, 1935. Hoplosaenidea irregularis (Takizawa 1978) and H. kanmiyai Kimoto, 1984 are transferred to Theopea and redescribed. A lectotype is designated for T. aureoviridis Chûjô, 1935. Five new species are described, T. cheni sp. nov. from Taiwan, T. geiseri sp. nov. from Northeast India, T. hainanensis sp. nov. from South China (Hainan Island), T. laosensis sp. nov. from West China, North Laos and Vietnam, and T. sekerkai sp. nov. from Central and South Laos. 

scholarly journals The Cenozoic Song Hong and Beibuwan Basins, Vietnam

1969 ◽  
Vol 26 ◽  
pp. 81-84 ◽  
Author(s):  
Michael B.W. Fyhn ◽  
Henrik I. Petersen ◽  
Lars Henrik Nielsen ◽  
Tran C. Giang ◽  
Le H. Nga ◽  
...  
Keyword(s):  
South China Sea ◽  
East Asia ◽  
Source Rock ◽  
South China ◽  
Source Rocks ◽  
South East Asia ◽  
Petroleum Potential ◽  
Western Margin ◽  
Stratigraphic Framework ◽  
And Inversion

The Vietnamese offshore margin holds a substantially underexplored petroleum potential. The key to unravelling this potential lies in understanding the tectono-stratigraphic framework of the region including the Cenozoic mechanisms governing syn-rift and source rock deposition. This is essential for prediction of, for instance the presence and nature of source rocks in South-East Asia and possible reservoir intervals in the syn-rift packages. The Vietnamese part of the Song Hong and Beibuwan Basins (Fig. 1) differs from other basins along the western margin of the South China Sea in that the Palaeogene syn-rift succession is sporadically exposed due to uplift and inversion. These exposures provide a unique glimpse into the Cenozoic syn-rift succession of the basin.

Sign in / Sign up

Export Citation Format

Share Document