Daba belt tectonic activity and trace rare earth elements of the fluid

Title: Daba belt tectonic activity and trace rare earth elements of the fluid
Author: Huang Qi beginning
Degree-granting units: Central South University
Keywords: tectonic stress field;; belt;; fluid;; calcite veins;; trace rare earth elements;; Daba
Summary:


The Mesozoic Indosinian and Yanshan movement, the formation of present-day tectonic Daba. Indosinian subduction and collision occurred north and south of Daba; Yanshanian intracontinental orogeny for the stage. Field and laboratory study showed Magnetic lifter that since the Mesozoic experienced a major tectonic belt Daba NE-SW compression and NW-SE squeeze two stress. Indosinian and Yanshanian are NE-SW compression, stress field is characterized by: σ1 (40 ° ∠ 2 °), σ3 (175 ° ∠ 88 °); NW-SE to NE-SW late extrusion extrusion, the stress field is characterized by: σ1 (143 ° ∠ 1 °), σ3 (267 ° ∠ 88 °). Depending on the structural deformation, NE to SW Daba can be divided into four different structural belts: thrust - thrust belt, basement detachment belt, cover belt and foreland detachment depression zone. The tectonic deformation with the development of different styles. NE to SW, ductile deformation of the nature of the transition to brittle deformation, deformation depth and strength decreases.


Daba Mountain tectonic zone of calcite veins http://www.999magnet.com/products/131-magnetic-lifter within the trace rare earth elements were analyzed. Rock with a single source, reflecting the more stable sedimentary environment. Rare earth elements with Eu anomaly, restore the environment into the vein environment. NE-SW extrusion process, activity, mainly rock dehydration fluid, there are rich Rb and Ba and REE and La / Yb and low fluid added. NW-SE extrusion process, activities are mainly from the surrounding fluid dehydration, also has rich Rb and Ba and REE and La / Yb (?) Di fluid added.
Degree Year: 2010