Method and system for predicting shortening amount of earth crust structure based on rock magnetic experiment

Abstract

The invention discloses a method and system for predicting the shortening amount of an earth crust structure based on a rock magnetic experiment, and the method comprises the steps: selecting a target rock sampling region, and carrying out the collection of a standard rock sample in the sampling region; performing a rock magnetic experiment on the standard rock sample in a preset experiment environment, performing residual magnetism analysis on the standard rock sample by adopting a principal component analysis method, and combining a residual magnetism analysis result and a rock magnetic experiment result to obtain a palaeomagnetic pole and a palaeolatitude of the standard rock sample; and performing wrinkle inspection on the standard rock sample to verify the accuracy of the palaeomagnetic pole and the palaeolatitude, and predicting the crustal structure shortening amount by using the palaeomagnetic pole and the palaeolatitude. According to the method, the rock magnetic experiment is performed on the standard rock sample in the preset experiment environment, and the accurate paleomagnetic pole and paleolatitude of the standard rock sample are obtained by combining the residual magnetism analysis result and the rock magnetic experiment result, so that geological mineral engineering is guided through the paleomagnetic pole, the paleolatitude and the crustal structure shortening amount.

Description

technical field [0001] The invention relates to the technical fields of structural geology and applied geophysics, in particular to a method and system for predicting crustal structure shortening based on rock magnetism experiments. Background technique [0002] The formation of the Qinghai-Tibet Plateau experienced plate compression, collision, and later uplift and shrinkage. At present, a large number of scholars have conducted in-depth research and discussion on it, but there has been great controversy over the collision time, collision process and post-collision crustal shortening of the India-Asia continent. For example: paleomagnetism, significant changes in terrigenous clastics in foreland basins, great changes in sedimentary lithofacies or paleontology, ultra-high pressure metamorphic eclogites formed by plate subduction, regional unconformity contact between Linzizong Group volcanic rocks and underlying strata, Significant changes in the speed of the northward drif...

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