大别山北缘定远组双峰式火山岩-新元古代晚期裂解事件记录

许雅雯; 李承东; 赵利刚; 孙烜烨; 许腾; 滕雪明

doi:10.3799/dqkx.2020.322

Volume 46 Issue 8

Aug. 2021

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Article Navigation > Earth Science > 2021 > 46(8): 2732-2750

Xu Yawen, Li Chengdong, Zhao Ligang, Sun Xuanye, Xu Teng, Teng Xueming, 2021. Bimodal Volcanic Rocks of Dingyuan Formation on the Northern Margin of Dabie Belt: A Witness of Late Neoproterozoic Rifting Event. Earth Science, 46(8): 2732-2750. doi: 10.3799/dqkx.2020.322

Citation:

Xu Yawen, Li Chengdong, Zhao Ligang, Sun Xuanye, Xu Teng, Teng Xueming, 2021. Bimodal Volcanic Rocks of Dingyuan Formation on the Northern Margin of Dabie Belt: A Witness of Late Neoproterozoic Rifting Event. Earth Science, 46(8): 2732-2750. doi: 10.3799/dqkx.2020.322

Citation:

Xu Yawen, Li Chengdong, Zhao Ligang, Sun Xuanye, Xu Teng, Teng Xueming, 2021. Bimodal Volcanic Rocks of Dingyuan Formation on the Northern Margin of Dabie Belt: A Witness of Late Neoproterozoic Rifting Event. Earth Science, 46(8): 2732-2750. doi: 10.3799/dqkx.2020.322

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Bimodal Volcanic Rocks of Dingyuan Formation on the Northern Margin of Dabie Belt: A Witness of Late Neoproterozoic Rifting Event

doi: 10.3799/dqkx.2020.322

Tianjin Center of China Geological Survey, Tianjin 300170, China

Received Date: 2020-05-21
Available Online: 2021-09-14
Publish Date: 2021-08-15

Abstract

Abstract

In order to understand the tectonic properties of the northern margin of Dabie belt,the stratum,age and geochemical characteristics of Dingyuan Formation were investigated and studied. Field survey shows that the Dingyuan Formation is composed of a set of metavolcanic rocks,mica schist,mica quartz schist,leptite and slate,etc.. The metavolcanics are mainly metabasalts and meta-rhyolitic volcanics which constitute typical bimodal volcanic formation. In addition,it contains Early Paleozoic tectono-stratigraphic unit. The LA-ICP-MS U-Pb dating of zircon from acidic volcanic rocks yields the ages of 725.7±1.4 Ma and 736.6±5.4 Ma,indicating the Neoproterozoic rather than the Early Paleozoic ages. The metabasalts are divided into two types: low Ti(TiO₂=1.19%) and high Ti(TiO₂=3.11% on average). The total amount of rare earth elements of low Ti basalts is lower than N-MORB type and the magma came from the depleted mantle source area. The high Ti basalt can be further divided into two types. One type is rich in Nb and Ta,and the ratio of incompatible elements is close to that of continental rift basalt. The other type of loss-Nb,Ta,Th,U and other elements,the magma probably came from the modified mantle by the lower crust or altered oceanic crust. Its Th/Ta is 1.6,which is close to the Th/Ta ratio of the continental rift basalt. In a word,the geochemical characteristics of the metamorphic basalts are very different,which reflects the heterogeneity of the source area of the mantle. Large ionic lithophile elements Rb,Ba,Th,U and K are enriched in acidic volcanic rocks,depletion Nb,Ta,P,Ti and other elements,the value of ε_Hf(t) is -3.0 to -10 by zircon Hf isotope analysis,two-stage Hf mode age (T_DM2(Hf)) is 1 630-2 258 Ma,it reveals that it came from a partial melting of the ancient crust. The Neoproterozoic bimodal volcanic rocks of the Dingyuan Formation was formed in the continental rift environment,not in the background of island arc structure. The bimodal volcanic rocks and the widely distributed contemporaneous magmatic rocks reveal an important continental margin rifting-magma event in the northern margin of the Yangtze Block during the Neoproterozoic period (800-611 Ma),which is ground surface response of the deep dynamics to the breakup of supercontinent Rodinia.
- Dingyuan Formation,
- bimodal volcanic rock,
- Neoproterozoic rifting event,
- northern margin of Dabie belt,
- geochronology,
- geochemistry

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References(57)

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