Depth-varying-to-density earth crust extension coefficient thermal calibration gravity anomaly retrieval method

Abstract

The invention discloses a depth-varying-to-density earth crust expansion coefficient thermal calibration gravity anomaly retrieval method. In the calculation process of a gravity retrieval earth crust expansion coefficient, a lithosphere thermal gravity anomaly calibration and depth constraint strategy is introduced, according to an iterative computation method of multiple parameter constraints such as a submarine topography, a sedimentary thickness, magnetic anomaly, an ocean age isochron and earthquake reflection and refraction, a distortion effect, caused by earth crust density changes resulted from lithosphere thermal disturbance, on gravity interpretation is corrected, and a basis is provided for knowing earth crust expansion and cracking processes.

Description

Technical field: [0001] The invention relates to the field of earth sciences, in particular to a depth-variable-density crustal extension coefficient heat-corrected gravity anomaly inversion method. Background technique: [0002] Glossary: [0003] Stretch factor : is the coefficient of the extension degree of the crust of the extensional basin. McKenzie (1978) proposed the uniform stretching model of the lithosphere, also known as the pure shear model, which describes the basic response of the lithosphere to stretching, and defines the stretching coefficient β=l / b, where l is the stretching The lithosphere width, b is the initial width, which is used to describe the extension and thinning degree of the crust. Near the ocean-continental boundary (COB) or near the spreading axis of oceanic ridges, the extension of the continental lithosphere varies in depth, and the amount of extension increases with depth. [0004] heat correction : During the stretching and thinning p...

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Problems solved by technology

However, thermal perturbations in the lithosphere will cause changes in the crustal density, which will distort the gravitational interpretation and should be corre...

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