昌宁-孟连结合带弄巴地区泥盆系、石炭系的时代及沉积环境：放射虫、碎屑锆石U-Pb年龄和Hf同位素约束

王冬兵; 唐渊; 罗亮; 廖世勇

doi:10.3799/dqkx.2020.076

Volume 45 Issue 8

Aug. 2020

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Wang Dongbing, Tang Yuan, Luo Liang, Liao Shiyong, 2020. Age and Tectonic Setting of Devonian and Carboniferous Fragments in Nongba Area of Changning-Menglian Suture Zone: Radiolarian, Detrital Zircon U-Pb Age and Hf Isotope Constraints. Earth Science, 45(8): 2989-3002. doi: 10.3799/dqkx.2020.076

Citation:

Wang Dongbing, Tang Yuan, Luo Liang, Liao Shiyong, 2020. Age and Tectonic Setting of Devonian and Carboniferous Fragments in Nongba Area of Changning-Menglian Suture Zone: Radiolarian, Detrital Zircon U-Pb Age and Hf Isotope Constraints. Earth Science, 45(8): 2989-3002. doi: 10.3799/dqkx.2020.076

Citation:

Wang Dongbing, Tang Yuan, Luo Liang, Liao Shiyong, 2020. Age and Tectonic Setting of Devonian and Carboniferous Fragments in Nongba Area of Changning-Menglian Suture Zone: Radiolarian, Detrital Zircon U-Pb Age and Hf Isotope Constraints. Earth Science, 45(8): 2989-3002. doi: 10.3799/dqkx.2020.076

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Age and Tectonic Setting of Devonian and Carboniferous Fragments in Nongba Area of Changning-Menglian Suture Zone: Radiolarian, Detrital Zircon U-Pb Age and Hf Isotope Constraints

doi: 10.3799/dqkx.2020.076

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China

Received Date: 2020-02-20
Publish Date: 2020-08-15

Abstract

Abstract

The pelagic abyssal sediments in orogenic belt are important basis for the restoration of the ancient ocean. The Changning-Menglian suture zone preserves a large number of marine sedimentary strata fragments,but it is not clear whether there are ocean basin facies pelagic sediments. Petrology,radiolarian age and detrital zircon U-Pb-Hf isotopes of the Carboniferous and Devonian fragments,which were thought to be the ocean basin facies sediments in the Nongba area,are studied in this paper. Early Carboniferous radiolarian fossils have been identified in the Carboniferous fragments. The detrital zircon ages of the Devonian fragment range from 3 266 Ma to 387 Ma,with the youngest group of 387-413 Ma. The detrital zircon ages of the basic tuff associated with radiolarian chert in the Carboniferous fragments range from 3 403 Ma to 341 Ma,and the youngest group is 341-354 Ma. Based on the detrital zircon ages and fossil data,it can be concluded that the primary depositional age of the Devonian fragments is limited to the Early-Middle Devonian,and that of the Carboniferous fragment is early-middle Early Carboniferous. The U-Pb age spectrum and Hf isotopic composition of detrital zircons indicate that Devonian and Carboniferous fragments have similar provenance,mainly from the Gondwana-related continental crust,and a small amount from the Paleo-Tethyan island arc. The Early-Middle Devonian fragments were originally deposited in the continental slope environment of Gondwana,while the early-middle Early Carboniferous fragments were originally deposited in the Gondwana-related continental slope to the edge of Paleo-Tethys ocean basin environment. It is one of the important research directions of Paleo-Tethys to find and study the ocean basin facies sedimentary rocks in the Changning-Menglian belt.
- zircon U-Pb dating,
- Hf isotope,
- radiolarian,
- sedimentary environment,
- Paleo-Tethys,
- Changning-Menglian suture zone,
- geochronology

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