陕西富平上奥陶统赵老峪组硅质岩地化特征及地质意义

史毅; 屈红军; 李文厚; 杜美迎; 王浩

doi:10.3799/dqkx.2018.181

Volume 45 Issue 1

Jan. 2020

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Article Navigation > Earth Science > 2020 > 45(1): 168-179

Shi Yi, Qu Hongjun, Li Wenhou, Du Meiying, Wang Hao, 2020. Geochemical Characteristics and Geological Significance of Siliceous Rocks in Upper Ordovician Zhaolaoyu Formation in Fuping Region, Shaanxi Province. Earth Science, 45(1): 168-179. doi: 10.3799/dqkx.2018.181

Citation:

Shi Yi, Qu Hongjun, Li Wenhou, Du Meiying, Wang Hao, 2020. Geochemical Characteristics and Geological Significance of Siliceous Rocks in Upper Ordovician Zhaolaoyu Formation in Fuping Region, Shaanxi Province. Earth Science, 45(1): 168-179. doi: 10.3799/dqkx.2018.181

Citation:

Shi Yi, Qu Hongjun, Li Wenhou, Du Meiying, Wang Hao, 2020. Geochemical Characteristics and Geological Significance of Siliceous Rocks in Upper Ordovician Zhaolaoyu Formation in Fuping Region, Shaanxi Province. Earth Science, 45(1): 168-179. doi: 10.3799/dqkx.2018.181

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Geochemical Characteristics and Geological Significance of Siliceous Rocks in Upper Ordovician Zhaolaoyu Formation in Fuping Region, Shaanxi Province

doi: 10.3799/dqkx.2018.181

Shi Yi^{1,2
,
,},
Qu Hongjun^{1,2
,
,},
Li Wenhou^1,2,
Du Meiying^1,2,
Wang Hao²

1.
State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
2.
Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2018-09-06
Publish Date: 2020-01-15

Abstract

Abstract

In Fuping region of Shaanxi Province, a suite of radiolarian siliceous rocks is developed in Upper Ordovician Zhaolaoyu Formation, which is associated with deep water carbonate rocks. The geochemical characteristics of siliceous rocks are of great significance in revealing the source of silicon and tectonic setting. On basis of the field profile, the petrological and geochemical analyses of siliceous rocks in Upper Ordovician Zhaolaoyu Formation in Fuping region, the origin and tectonic setting are studied. It is found that Zhaolaoyu Formation is dominated by dark gray lamellose limestone, with lamellar radiolarian siliceous rocks, conglomerate limestone, calcarenite, patchy limestone and volcanic tuff. Siliceous rocks are cryptocrystalline-microcrystalline, containing radiolarian fossils. The geochemical test of the samples yields the value of Al/(Al+Fe+Mn) (average 0.68), MnO/TiO₂ (average 0.18), ΣREE (average 46.41), δCe (average 0.95), δEu (average 1.13), La_N/Yb_N (average 1.15), La_N/Ce_N (average 1.08), suggesting that the tectonic environment is continental margin and the silicons are mainly of terrigenous origin. We believe that the siliceous rocks in Fuping region were formed on the northern margin of the Erlangping retroarc foreland basin, which was formed between the southern margin of North China Block and the North Qinling under the background of subduction of the Yangtze Plate to the North China Plate during the Ordovician.
- siliceous rocks,
- Upper Ordovician,
- Zhaolaoyu Formation,
- Fuping region,
- Erlangping retroarc foreland basin,
- geochemistry

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Geochemical Characteristics and Geological Significance of Siliceous Rocks in Upper Ordovician Zhaolaoyu Formation in Fuping Region, Shaanxi Province

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