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Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand

Yuzhi Zhang Yuejun Wang Boontarika Srithai Burapha Phajuy

Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand[J]. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
引用本文: Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand[J]. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
Citation: Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4

Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand

doi: 10.1007/s12583-015-0646-4

Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand

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出版历程
  • 收稿日期:  2016-06-12
  • 修回日期:  2016-06-12
  • 刊出日期:  2016-06-12

Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand

doi: 10.1007/s12583-015-0646-4

摘要: The Changning-Menglian suture in SW Yunnan has been accepted as the Paleotethyan main ocean. However, it has been a matter of debate as to its southerly extension in NW Thailand (the Chiang Mai-Chiang Rai vs. Nan-Uttaradit zone). Our field investigation identified the high-iron basal- tic rocks in the Chiang Dao Permian standard profile in NW Thailand. The high-iron rocks provide crucial records for understanding the controversy on the location of Paleotethyan main ocean in NW Thailand. The Early Permian high-iron samples show extremely high FeOt (20.96 wt.%–25.56 wt.%) and TiO 2 (6.07 wt.%–6.34 wt.%) and low SiO 2 (38.54 wt.%–43.46 wt.%) and MgO (1.61 wt.%–2.40 wt.%) contents. Such characteristics are similar to those of the Fenner differentiation trend rarely ob- served in the natural system, distinct from those of the “normal” Bowen trend. Their chondrite- normalized REE and primitive mantle-normalized patterns are generally similar to those of typical OIB. The initial 87 Sr/ 86 Sr ratios and ε Nd (t) values range from 0.704 677 to 0.705 103 and 3.16 to 3.48, respectively, falling near the field of typical OIB (oceanic-island basalt). These data synthetically sug- gest that the Chiang Dao high-iron rocks are the products of high-degree partial melting of peridotite with Fe-rich eclogitic blobs/streaks in response to a seamount setting. In comparison with the Permian tectonic setting in SW Yunnan and NW Thailand, it is inferred that the Paleotethyan Ocean was lo- cated between the Shan-Thai terrane of Sibumasu and Sukhothai arc along the Inthanon zone of the Chiang Mai-Chiang Rai rather than Nan-Uttaradit zones.

English Abstract

Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand[J]. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
引用本文: Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand[J]. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4
Citation: Yuzhi Zhang, Yuejun Wang, Boontarika Srithai, Burapha Phajuy. Petrogenesis for the Chiang Dao Permian High-Iron Basalt and Its Implication on the Paleotethyan Ocean in NW Thailand. Journal of Earth Science, 2016, 18(3): 425-434. doi: 10.1007/s12583-015-0646-4

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