Petrogenesis of Early Mesozoic volcanic rocks in southeastern NE China: Geochemical and Sr–Nd–Pb–O isotopic evidences

Wei，Jing Yang1; Pei，Fu Ping1; Xu，Wen Liang1,2; Sun，Jing Gui1; Zhou，Hao3; Sang，Tian Jiao1

2023

10.1016/j.lithos.2022.106972

LITHOS   Impact Factor & Quartile

0024-4937

1872-6143

This paper reports a study of whole-rock geochemical, Sr–Nd–Pb isotopic compositions and zircon U[sbnd]Pb ages and O isotopic compositions of Late Triassic to Early Jurassic volcanic rocks of the Yanbian–Dongning area, northeastern China. The obtained data are used to constrain the petrogenesis of these rocks and to provide new insights into the timing of transition from the Paleo-Asian to the Paleo-Pacific tectonic regime. The studied Late Triassic to Early Jurassic volcanic rocks can be divided into two periods: Late Triassic–early Early Jurassic (212–198 Ma) and late Early Jurassic (ca. 181 Ma). The former rocks display high SiO and total alkalis contents, high Ga/Al ratios, depleted Sr[sbnd]Nd and highly radiogenic Pb isotopic signatures, and low zircon δO values. The former rocks have a genetic relationship with coeval intrusions, and their primitive melt was derived from juvenile crustal materials and underwent subsequent differentiation and assimilation of low-δO rocks. In contrast, the latter rocks have SiO contents of 49.00–63.30 wt%, are classified as calc-alkaline, and display arc-type trace-element features. Their geochemical and Sr–Nd–Pb–O isotopic compositions imply derivation from the partial melting of depleted mantle wedge metasomatized by oceanic slab-derived fluid and sediment melt. Combining these new results with published data, the Late Triassic–early Early Jurassic volcanic rocks are inferred to have formed in a rift-like extensional setting, whereas the late Early Jurassic volcanic rocks were generated in a subduction-related setting. The transition from the Paleo-Asian to the Paleo-Pacific tectonic regime occurred during the Early Jurassic.

Geochemistry and Sr–Nd–Pb–O isotope Late Triassic to Early Jurassic Northeastern China Tectonic regime transition Volcanic rocks

SCI

English

Others

National Key Research and Development Program of China[2017YFC0601304];National Natural Science Foundation of China[41972053];

Geochemistry & Geophysics ; Mineralogy

Geochemistry & Geophysics ; Mineralogy

WOS:000933793800005

ELSEVIER

GEOSCIENCES

2-s2.0-85143145960

Scopus

1.College of Earth Sciences,Jilin University,Changchun,130061,China
2.Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources,Changchun,130061,China
3.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China

Wei，Jing Yang,Pei，Fu Ping,Xu，Wen Liang,等. Petrogenesis of Early Mesozoic volcanic rocks in southeastern NE China: Geochemical and Sr–Nd–Pb–O isotopic evidences[J]. LITHOS,2023,436-437.

Wei，Jing Yang,Pei，Fu Ping,Xu，Wen Liang,Sun，Jing Gui,Zhou，Hao,&Sang，Tian Jiao.(2023).Petrogenesis of Early Mesozoic volcanic rocks in southeastern NE China: Geochemical and Sr–Nd–Pb–O isotopic evidences.LITHOS,436-437.

Wei，Jing Yang,et al."Petrogenesis of Early Mesozoic volcanic rocks in southeastern NE China: Geochemical and Sr–Nd–Pb–O isotopic evidences".LITHOS 436-437(2023).