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1. Ultra-basic rock hydrothermal alteration type Zhengzhou and Wangshankou talc deposit: the mining area is exposed to the Longbeixi Formation, the green curtain and the mica quartz schist, and the ore body is composed of peridotite and diabase by hydrothermal alteration. forming magnesite talc rocks, ore vein shape (single pulse), magnesite ore types talc talc and two kinds of green clay. Magnesite Talc: gray-green, 45% of talc and 90% magnesite> 10% to 40%, chlorite <10%, the magnet 3% to 10% of the ore, is the main type, accounting Chief The amount is 95%.
Green mud talc mine: talc accounts for 60% to 75%, chlorite is 15% to 40%, and a small amount of magnetite. Chemical composition: primary ore SiO 2 41.72%, Mg 31.76%, Fe 2 O 3 6.65%, CaO 1.05%, Al 2 O 3 0.95%, loss on ignition 17.56%. Weathered ore: SiO 2 54.71%, Mg 26.5%, Fe 2 O 3 9.22%, CaO 0.08%, Al 2 O 3 1.66%, loss on ignition 7.39%.
2. Sedimentary metamorphic hydrothermal reformation The ore-bearing strata are located in the upper middle part of the Sinian Longbeixi Formation. The main lithology is mica quartz schist, angled flash schist, and talc quartzite . The five mines are small in scale, low in MgO content, and high in Fe 2 O 3 content. Only the Jianshanshan ore deposit has a certain prospect. The Shantou mine talc deposit is located in the upper part of the Longbeixi Formation, and the top and bottom of the ore body is talc. Quartzite and strip-shaped quartzite, the No. 1 ore body is 1 meter thick, and the No. II ore body is 1.66 meters thick and extends about 150-200 meters. The mineral composition is mainly talc, a small amount of mica and quartz, chemical composition, MgO 29.81% ~ 31.37%, CaO0.25% ~ 0.29%, Al 2 O 3 0.75% ~ 1.34%, Fe 2 O 3 0.63% ~ 1.10% .
Talc mine
It has been proved that there are two places in the field of Putian Changji and Zhenghe and Wangshankou. The type of deposits with industrial significance is the ultra-basic rock hydrothermal alteration. Deformation hydrothermal reformation type, only five mineralization points have been found.