Zircon U-Pb isotopic age of Ye Yen Sun granite complex in Phan Si Pan uplift and relationship to the Red River Shear zone

Trần Trọng Hòa, Phạm Thị Dung, Trần Tuấn Anh, Ching- Ying Lan, Tadashi Usuki, Trần Văn Hiếu, Vũ Hoàng Ly

Abstract


Zircon U-Pb isotopic age data acquired from an LA-ICP-MS for five samples of granite, porphyre granite collected from four sections in the Phan Si Pan uplift area: Sa Pa-Bình Lư, Tung Qua Lìn-Sì Lờ Lầu, Nậm Xe-Sìn Suối Hồ, Trung Lèng Hồ-Pờ Hồ. The yielded results are respectively 31.25 ±0.43 Ma (LTH 21B sample-light granite undeformation), 32.94 ±0.79 Ma (LTH 20A sample-porphyre granite), 34.2±1.2 Ma (PSP 40A sample- biotite granite), 34.55±0.56 Ma (PSP 55 sample-biotite granite porphyry) and 35.39±0.44 Ma (PSP 60 sample- biotite granite of small grained size, light colored). These ages suggest that Ye Yen Sun granite is late Eocene - early Oligocen coinciding with age of initiation of left-lateral strike-slip motion along the Red River shear zone. Besides, by analyzing internal texture and comparing Th/U ratios of zircons at different age intervals it is revealed that the core of all the zircon crystals show two age ranges of, respectively, 750-800 Ma and 201-253 Ma, probably corresponding to the age of Po Sen calc-alkaline granite complex (750.1 ± 7 Ma) and Phan Si Pan biotite-hornblende granite (250Ma).


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DOI: https://doi.org/10.15625/0866-7187/34/4/2805 Display counter: Abstract : 53 views. PDF : 63 views.

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Vietnam Journal of Earth Sciences, ISSN: 0866-7187; 2615-9783

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