ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geochemistry
Volume 13 - 2025 | doi: 10.3389/feart.2025.1624653
Petrogenesis of late Ordovician high Ba-Sr quartz diorite in the northern Qinling orogeny and its geological implication
Provisionally accepted
- 1Shaanxi Institute of Geological Survey, Xi'an, China
- 2Shaanxi Center of Mineral Geological of Geological Survey, Xi'an, China
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Late Ordovician to the early Silurian medium-acidic magmatic rocks with high Ba-Sr characters are well-exposed in the northern Qinling orogeny, and are ideal objects to discuss regional magmatism and constrain tectonic evolution. LA-ICP-MS zircon U-Pb geochronology of the quartz diorite in the northern Qinling terrane yielded a weighted mean 206 Pb/ 238 U age of 444 ± 3 Ma, which is interpreted as intrusion time of monzodioritic magma. The quartz diorite show high contents of Ba (357-886 ppm) and Sr (198-382 ppm) that are consistent with the high Ba-Sr magmati rocks. The high Ba-Sr quartz diorite samples show high SiO2 and MgO contents of 58.26-63.49% and 2.45-3.20%, respectively, and possess large FeO t /MgO ratios ranging from 1.71 to 2.02. In addition, the high Ba-Sr quartz diorite analyses are characterized by LREE-enriched, HFSE-and HREE-depleted patterns with moderate negative Eu anomalies (δEu = 0.61-0.81) and low ratios of Sr/Y (5-13) and (La/Yb)N (5-7) that are indicative of arc magmatic-related affinity. In combination with moderate Ba/Th, Ba/La, and Th/Nd ratios of the geochemical results, it is proposed that the high Ba-Sr quartz diorite are formed by partial melting of enriched mantle wedge that is metasomatized by subduction fluids and melt interaction associated with northward subduction of Shangdan Ocean. Therefore, the extensive late Ordovician magmatic activities, derived from metasomatic mantle wedge, are facilitated the early Paleozoic crustal growth of the northern Qinling orogeny.
Keywords: Northern Qinling orogeny, late Ordovician quartz diorite, high Ba-Sr granite, mantle wedge, Crustal growth, mantle wedge
Received: 07 May 2025; Accepted: 09 Jun 2025.
Copyright: © 2025 Du, Zhao, Zhang, Zhang, Wang, Li and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Biao Du, Shaanxi Institute of Geological Survey, Xi'an, China
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