Crustal thickness evolution of the Central Lhasa Terrane inferred from trace elements in zircon of Tangra Yumco

doi:10.13745/j.esf.sf.2024.4.60

Abstract

Abstract:

The Lhasa terrane is located in the southern part of the Tibetan Plateau and is one of the regions with the greatest crustal thickness globally. However, the timing and process of crustal thickening in the Lhasa terrane remain debated. Zircon trace element characteristics are controlled by the co-existing relationships between zircon and other trace element carrier minerals, meaning different minerals have varying partition coefficients, thus zircon trace elements can be used to quantitatively reconstruct crustal thickness. This study conducted U-Pb geochronological and trace element geochemical research on zircons from igneous and sedimentary rocks in the Dangra Yongcuo area of the central Lhasa terrane. Using zircon europium anomalies to quantitatively reconstruct crustal thickness, the results reveal that the central Lhasa terrane experienced two crustal thinning events (150-130 Ma and 85-65 Ma) and two crustal thickening events (130-85 Ma and 65-15 Ma) during the Jurassic to Neogene periods. During 150-130 Ma, crustal thinning in the central Lhasa terrane was primarily related to slab retreat of the Bangong-Nujiang Ocean. Between 130-85 Ma, the central Lhasa terrane underwent crustal thickening due to northward subduction of the Neo-Tethys Ocean and southward subduction of the Bangong-Nujiang Ocean. During 85-65 Ma, slab retreat of the Neo-Tethys Ocean and back-arc extension led to another crustal thinning event. From 65-15 Ma, collision and subsequent compression between the Indian and Eurasian plates caused the central Lhasa terrane to thicken again.

Key words: Tibetan Plateau, central Lhasa terrane, crustal thickness, zircon U-Pb age, zircon trace elements

CLC Number:

LIU Xiaohui, LIU Yimin, DING Lin, GUO Xiaoyu, HUANG Xingfu, LI Huilin, GAO Rui. Crustal thickness evolution of the Central Lhasa Terrane inferred from trace elements in zircon of Tangra Yumco[J]. Earth Science Frontiers, 2025, 32(1): 343-366.

Figures/Tables 8

References 107

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样品号	GPS
样品号	纬度/°N	经度/°E	海拔/m
TY01	30.776 82	86.741 93	5 359
TY02	30.783 08	86.737 98	5 364
TY03	30.775 10	86.731 98	5 181
TY04	30.750 10	86.710 77	4 819
TY05	30.750 10	86.710 77	4 819
TY06	30.750 43	86.718 45	4 843
TY07	31.069 43	86.638 08	4 753
TY08	31.069 19	86.636 21	4 755
TY09	31.067 64	86.634 32	4 764
TY11	31.069 50	86.625 08	4 651
TY12	31.069 68	86.625 50	4 655
TY13	31.069 72	86.625 65	4 663
TY14	31.069 77	86.625 65	4 664
TY15	31.069 87	86.625 68	4 685
TY18	31.070 18	86.625 92	4 660
TY20	31.069 75	86.625 70	4 648

样品号	GPS
样品号	纬度/°N	经度/°E	海拔/m
TY01	30.776 82	86.741 93	5 359
TY02	30.783 08	86.737 98	5 364
TY03	30.775 10	86.731 98	5 181
TY04	30.750 10	86.710 77	4 819
TY05	30.750 10	86.710 77	4 819
TY06	30.750 43	86.718 45	4 843
TY07	31.069 43	86.638 08	4 753
TY08	31.069 19	86.636 21	4 755
TY09	31.067 64	86.634 32	4 764
TY11	31.069 50	86.625 08	4 651
TY12	31.069 68	86.625 50	4 655
TY13	31.069 72	86.625 65	4 663
TY14	31.069 77	86.625 65	4 664
TY15	31.069 87	86.625 68	4 685
TY18	31.070 18	86.625 92	4 660
TY20	31.069 75	86.625 70	4 648