Xinjiang magnetic iron ore deposit geochemistry sea

Title: Xinjiang magnetic iron ore deposit geochemistry sea Author: Tang Pingzhi Degree-granting unit: Kunming University of Science Keywords: mafic - ultramafic rocks;; volcanic hydrothermal;; geochemistry;; mineralization;; magnetic iron ore sea Abstract: This article is borne in Beijing Institute of Geology and Mineral Resources of the National Key Basic Research Development Program (973 Project), "Central Asian Orogenic Belt and Continental Dynamics mineralization process" project of the "Strong magnets post-collision crust-mantle exchange and mineralization "Project (2007CB411304) funding to complete.
In this paper, marine magnetic iron ore deposits in Xinjiang for the study, a comprehensive analysis on the basis of previous research results, through field trips and indoor field microscope, the system to carry out rocks, ores, minerals, geochemical study of magnetic iron ore sea deposit geochemistry, combined with the deposit comparison studies to further reveal the causes of the magnetic characteristics of the sea and deposit formation mechanism. Mainly to obtain the following understanding:
(1) magnetic sea mines and mineralization related to mafic - ultramafic rocks, the olivine gabbro, troctolite, gabbro, diabase, basalt, etc., for the iron-rich calc-alkaline basalt series, formed in the post-collisional extensional stage. Characteristics of a multi-phase intrusive diabase, an original magma by fractional crystallization of residual melt after crystallization of the product, its total iron content is higher than troctolite and olivine gabbro, indicating that fractional crystallization of iron in the late stage magmatic enrichment.
(2) magnetite ore P2O5, SiO2, and indicate the source of deep material Co, Ni, Cu content is higher; REE characteristics of magnetite and diabase are similar, indicating that the formation of magnetic iron ore and mining the sea diabase closely related, mainly from the diabase body of magnetite; ore V, Ti, Cr content is minimal, and magnetite are different magmatic differentiation.
(3) REE ore and altered rocks similar to mine; to the relative loss of pyrite S, enriched with Fe and Co is characterized, Co / Ni ratio greater than 1, indicating the formation of ore deposits and magmatic hydrothermal activities.
(4) magnetic sea mine was first discovered in the black pillar, the compositions of iron-rich magmatic activity display and related mafic magma and the formation http://www.chinamagnets.biz/ of contact metasomatic product of volcanic hydrothermal mineralization and provide support; black pillar of the form late in the mineralization, the formation of magnetite from the early depletion effect.
(5) of cobalt-containing magnetite ore generally higher individual cobalt-rich sulphide ore up to 0.16%, with a comprehensive value; Co mainly in pyrite, pyrrhotite and other sulfides, and Hui independent mineral cobalt cobalt and arsenic orthorhombic arsenic cobalt, on the one hand reflects the deeper into the source of minerals, is another example of iron and cobalt in the magma - hydrothermal at different stages of evolution are the product of the formation of cobalt trend in the late stages of the hydrothermal enrichment.
(6) deposits with the Yangtze River Cihai typical skarn iron ore and iron ore in the porphyry-type mineralization mechanisms, etc., there are http://www.chinamagnets.biz/ some similarities, but the sea and magnetic ore deposits in the rock mass is more biased base nature, represents the type of iron ore deposits of the end-side base. Degree Year: 2010