Is There an Intermediate Lower Crust Beneath the Eastern China?(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第06期
- Page:
- 849-858
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Is There an Intermediate Lower Crust Beneath the Eastern China?
- Author(s):
- WANG Ji-qing; WANG Yang
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
- Keywords:
- lower crust; seismic wave velocity; density; mafic rock; petrophysics; lithology; North China; the eastern China
- PACS:
- P313.3
- DOI:
- -
- Abstract:
- Based on crustal velocities of the main tectonic units in the eastern China summarized by Li et al. and Gao et al., the lower crustal composition beneath the eastern China was discussed. Predictions of the lower crustal composition have two aspects: comparing the observed P-wave velocities between the crust and the various rocks measured by Christensen et al.; transferring the lower crustal velocity model to density model, according to the relationship between P-wave velocity and density proposed by Hasterok et al., and the errors of density are estimated by Monte Carlo method. The results show that P-wave velocities of the lower crust of the main tectonic units in the eastern China correspond with those of mafic rocks; most of the densities of the lower crust are greater than 3 000 kg.m-3, which belong to mafic rocks. Therefore, the lower crust beneath the eastern China is suggested to mafic in composition.
Last Update: 2016-12-01