Origin and tectonic implication of early Mesozoic “mung bean rock” in the western margin of the Yangtze Platform: Zircon U-Pb age, trace element and Hf isotope constraints

doi:10.13745/j.esf.sf.2023.2.67

Abstract

Abstract:

In order to clarify the source of volcanic ash found in early Mesozoic “mung bean rocks” and the spatiotemporal relation between the volcanic ash and Paleotethyan arc volcanism, geochronology, trace elements and Hf isotope of zircons from samples collected from two mung bean rock layers, Wumengshan area, northeastern Yunnan, are analyzed. For rock sample from the Jialingjiang Formation, it yields zircon U-Pb age of (250.0 ± 2.8) Ma, ε_Hf(t) values from -18.1 to -9.5 and T_DM2 ages of 2141-1674 Ma, and from the Guanling Formation it yields zircon U-Pb age of (247.0 ± 1.2) Ma, ε_Hf(t) values from -16.4 to -7.5 and T_DM2 ages of 2050-1559 Ma. The similarity of results between samples indicates the mung bean rocks are derived from the same source, and are products of Paleo-Mesoproterozoic crustal materials. The trace element characteristics of zircons from mung bean rocks are consistent with data from acidic magmas, indicating protoliths of mung bean rocks are felsic. Combined with previous results, it is determined that volcanic ash found in mung bean rocks comes from the Sanjiang orogenic belt. Evidences have shown that there exists a magmatic arc along the Sanjiang-Songma-Shiwandashan area during the Early-Middle Triassic, arisen from the subduction of the Paleo-Tethys Ocean, and the mung bean rocks are records of volcanic activities caused by the subduction of the ancient Tethys oceans. Combined with geological data, it is considered the ancient Tethys arc volcanism starts before mung bean rock diagenesis in the Jialingjiang Formation (254.9 Ma) and lasts until sedimentation at the bottom of the Guanling Formation (247.1 Ma).

Key words: mung bean rocks, zircon U-Pb dating, Hf isotope, Paleo-Tethys, magmatic arc

CLC Number:

CHUAN Maoshan, HU Le, LIN Ruxi, MAO Chongzhen, LI Shizhong, LI Suoming, YUAN Yongsheng. Origin and tectonic implication of early Mesozoic “mung bean rock” in the western margin of the Yangtze Platform: Zircon U-Pb age, trace element and Hf isotope constraints[J]. Earth Science Frontiers, 2024, 31(2): 204-223.

Figures/Tables 13

Fig.1 Tectonic outline(a,b) and geological map (c) of the study area。Modified after[12].

Fig.2 The field (a, c) and microscopic pictures (b, d) of the mung bean rocks from the Jialingjiang and Guanling Formation in the Wumeng mountain area

Table 1 Zircon trace elements analysis for the mung bean rocks in the Wumeng mountain area

Table 2 Zircon U-Pb isotopic dating results for the mung bean rock samples from the Wumeng mountain area

Table 3 Hf isotopic analysis for zircons from PM054-6-1 and PM054-22-1 samples

Fig.3 Zircon cathodoluminescence (CL) images and ages of the mung bean rocks from the Wumeng mountain area

Fig.4 Chondrite-normalized REE patterns of the zircons. Adapted from [16].

Fig.5 U-Pb concordia age and relative probability plots of the zircons from the mung bean rocks in the Wumeng mountain area

Fig.6 Zircon εHf(t) versus the emplacement ages. Adapted from [22].

Fig.7 Discrimination of volcanic rock lithology by zircon trace elements Nb/Ta-Y diagram. Adapted from [28].

Fig.8 Discrimination of tectonic setting by mung bean rock zircon trace elements

Fig.9 Distribution characteristics of εHf(t) values of zircons trace element and their tectonic setting

Fig.10 Zircon age and Hf isotope correlation of Sanjiang-SongMa-Shiwandashan Orogen (Background image and part of data are from [19,25-26,45,48-49,52-53])

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