Petrogenesis of Late Triassic Trachyte and Basic Dike Swarms in Northern Dabashan and Its Geological Significance

CHEN Tao; CHEN Junlu; LI Ping; ZHU Weihong; HAO Chenyu; SUN Jiming; WANG Jian; YAN Lingli

doi:10.12401/j.nwg.2023071

2025 Vol. 58, No. 1

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CHEN Tao, CHEN Junlu, LI Ping, ZHU Weihong, HAO Chenyu, SUN Jiming, WANG Jian, YAN Lingli. 2025. Petrogenesis of Late Triassic Trachyte and Basic Dike Swarms in Northern Dabashan and Its Geological Significance. Northwestern Geology, 58(1): 93-105. doi: 10.12401/j.nwg.2023071

Citation:

CHEN Tao, CHEN Junlu, LI Ping, ZHU Weihong, HAO Chenyu, SUN Jiming, WANG Jian, YAN Lingli. 2025. Petrogenesis of Late Triassic Trachyte and Basic Dike Swarms in Northern Dabashan and Its Geological Significance. Northwestern Geology, 58(1): 93-105. doi: 10.12401/j.nwg.2023071

Petrogenesis of Late Triassic Trachyte and Basic Dike Swarms in Northern Dabashan and Its Geological Significance

1.
Shaanxi Institute of Surveying and Mapping of Land Ltd, Xi’an 710054, Shaanxi, China
2.
Xi’an Center of China Geological Survey, Xi’an 710119, Shaanxi, China
3.
Strata−type Section for the Bottom of Wenlock−Shaanxi Ziyang Field Scientific Observation, Ministry of Natural Resources, Xi’an 710119, Shaanxi, China
4.
Shaanxi Mineral Resources and Geological Survey, Xi’an 710068, Shaanxi, China

More Information

Corresponding author: CHEN Junlu, chjl0116@163.com

Received Date: 08 February 2023

Revised Date: 16 August 2023

Publish Date: 20 February 2025

Abstract

Abstract

An amount of basic dikes and alkaline igneous rock occurred in Ziyang−Pingli−Zhuxi regions of the North Daba Mountain, most of these rock series are believed to have been formed in Early Paleozoic magmatic activity, while the zircon U−Pb isotope dating of the basic dike swarms and trachyte in this study show them formed at (219.5 ± 2.2)Ma and (223.9 ± 2.8) Ma, respectively. The rock series can be regarded as a product of Late Triassic magmatism. The diabase from the basic dike swarms shows a characteristic of high Ti and low Si, trachyte shows a feature of high Ti and is rich in alkali, both of which have some differences for the fractionation of REE. The Pb−Sr−Nd isotopic composition of the diabase shows a source region of OIB, with some additions of enrichment material of EmⅡ and upper crust, the trachyte shows an obvious rise inthe Primitive Mantle normalized diagram. Thus, both of them are formed by the intra-plate magmatism. The Late Triassic trachyte−diabase assemblage in North Beidaba Mountain is considered to have been formed by the continuous intraplate extension after the closure of the Mian−Lue Ocean, also is a geological record of mantle derived magma in South Qinling.
- north Daba Mountain /
- alkaline volcanic rocks /
- Diabase swarm /
- Triassic magmatic activity /
- petrogenesis

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References

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