scholarly journals Petrogenesis and zircon U–Pb ages of the Thien Ke granitic pluton in the Tam Dao region: Implications for early Paleozoic tectonic evolution in NE Vietnam

2014 ◽  
Vol 109 (5) ◽  
pp. 209-221 ◽  
Author(s):  
Thuy Thi Bich NGUYEN ◽  
Pham Trung HIEU ◽  
Tran Thanh HAI ◽  
Bui The ANH ◽  
Nguyen Thi XUAN ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Early Paleozoic ◽  
Granitic Pluton

Petrogenesis of the ∼500 Ma Fushui mafic intrusion and Early Paleozoic tectonic evolution of the Northern Qinling Belt, Central China

2017 ◽  
Vol 141 ◽  
pp. 74-96 ◽  
Author(s):  
Yu Shi ◽  
Xiaoli Pei ◽  
Paterno R. Castillo ◽  
Xijun Liu ◽  
Haihong Ding ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Central China ◽  
Early Paleozoic ◽  
Mafic Intrusion

Neoproterozoic-Early Paleozoic tectonic evolution of the western part of the Kyrgyz Ridge (Northern Tian Shan) caledonides

Geotectonics ◽  
2013 ◽  
Vol 47 (6) ◽  
pp. 377-417 ◽  
Author(s):  
K. E. Degtyarev ◽  
A. V. Ryazantsev ◽  
A. A. Tretyakov ◽  
T. Yu. Tolmacheva ◽  
A. S. Yakubchuk ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Early Paleozoic ◽  
Tian Shan

Ordo-Silurian assemblage in the Indochina interior: Geochronological, elemental, and Sr-Nd-Pb-Hf-O isotopic constraints of early Paleozoic granitoids in South Laos

2020 ◽  
Vol 133 (1-2) ◽  
pp. 325-346 ◽  
Author(s):  
Yuejun Wang ◽  
Yuzhi Zhang ◽  
Xin Qian ◽  
Vongpaseuth Senebouttalath ◽  
Yang Wang ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
High Field ◽  
Igneous Rocks ◽  
Early Paleozoic ◽  
Isotopic Data ◽  
High Field Strength ◽  
Tectonic Zone ◽  
Type Granite ◽  
Juvenile Crust ◽  
South Tibet

Abstract In order to verify the early Paleozoic accretionary assemblage in the Indochina interior and constrain the Prototethyan tectonic evolution in Southeast Asia, this study presents a set of new U-Pb geochronological, elemental, and Sr-Nd-Pb-Hf-O isotopic data for the fifty-two representative granitoids in South Laos. The granitoids from the Kontum terrane, Tam Ky-Phuoc Son tectonic zone, and southern Truong Son igneous zone in South Laos yield the crystallization ages of 464–485 Ma, 455–471 Ma, and 427–446 Ma, respectively, with a northerly younging trend within the Indochina interior. They are mainly monzogranite with A/CNK = 0.96–1.99 and K2O > Na2O, which are marked by enrichment in large-ion lithophile elements and depletion in high field strength elements with remarkable Nb-Ta, Sr-P, and Ti negative anomalies. Their initial 87Sr/86Sr ratios range from 0.70510 to 0.71559, εNd(t) from −9.5 to −3.0, (206Pb/204Pb)i from 18.65 to 19.72, (207Pb/204Pb)i from 15.66 to 15.80, and (208Pb/ 204Pb)i from 38.84 to 39.79. The corresponding zircon ɛHf(t) and δ18O values are in the range of −10.6 to +1.0 and 6.88‰ to 8.94‰, respectively. In addition, their Sr-Nd-Pb and Hf-O isotopic compositions are generally similar with those of time-equivalent granitoids in South Tibet and SW Yunnan, China, and synchronous mafic-intermediate igneous rocks in South Laos, but distinctive from those of the supracrustal sedimentary-derived South China Paleozoic granite and Lincang-Sukhothai S-type granite. The early Paleozoic granitoids in South Laos might have originated from a mixed source of the wedge-derived juvenile crust coupled with supracrustal materials. All these data synthetically suggest the southward subduction of the Tam Ky-Phuoc Son Ocean and the northerly on-growing Ordo-Silurian accretionary orogenesis within the previously defined “single-ancient” Indochina block. The assemblage of the Indochina block might initiate at ca. 430 Ma in the Silurian and terminate in the Early-Middle Devonian.

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