Magmatic record of India-Asia collision
Di-Cheng Zhu1, Qing Wang1, Zhi-Dan Zhao1
1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China.
Scientific Reports
|September 24, 2015
Summary
A magmatic flare-up linked to slab breakoff provides new evidence for the India-Asia collision timing. This event suggests the initial collision occurred earlier, around 55 million years ago.
Area of Science:
- Geology
- Geochronology
- Geochemistry
Background:
- The India-Asia collision zone records significant magmatic activity.
- Understanding the precise timing of this collision is crucial for plate tectonic models.
Purpose of the Study:
- To analyze new geochronological and geochemical data from the India-Asia collision zone.
- To identify key events in the collisional history and refine the timing of initial India-Asia contact.
Main Methods:
- Collection and analysis of new geochronological data.
- Geochemical analysis of magmatic rocks.
- Interpretation of geological and geochemical datasets in the context of plate tectonics.
Main Results:
- Recognition of a distinct magmatic flare-up event around 52-51 million years ago, attributed to slab breakoff.
- Observed migration of continental arc magmatism in southern Tibet from 80-40 Ma.
- Correlation of the magmatic flare-up with a decrease in the India-Asia convergence rate.
Conclusions:
- Slab breakoff of the Neo-Tethyan oceanic lithosphere at approximately 53 Ma likely caused the slowdown of the Indian plate.
- The initial India-Asia collision is proposed to have occurred earlier, around 55 Ma, rather than at the time of the magmatic flare-up.
- The identified magmatic event serves as a critical tie-point for dating the collisional record.
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