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• W2376036222 abstract "The Middle-Lower Yangtze Polymetallic Ore Belt is one of the most important metallogenic belts in East China,comprising more than 200 polymetallic( Cu-Fe-Au,Mo,Zn,Pb,Ag) deposits. Ningwu and Luzong ore distrcts are the most important component of this belt. In these districts,volcanic-subvolcanic rocks,intrusions and subvolcanic rocks-related iron deposits which are well known as porphyrite iron deposits in China are widespread,during the Late Mesozoic. Based on the geological characteristics,spatial distribution and relationship with volcanic-subvolcanic rocks,the famous iron porphyrite deposit model has been established which improved the development of metallogenic theory and the effective guidance of porphyrite deposit prospecting greatly. This mineralization model emphasizes mainly magmatic-hydrothermal role, but the sulfate evaporate salt layers, at the top of the Zhouchongcun group in Middle Triassic,did not cause the attention in the role of mineralization. And this model mainly reflects the mineralization in shallow. The latest researches and prospecting results reveal that the Middle Triassic sulfate evaporates salt layers and mineralization has closely relationship. However,the ore-controlling mechanism of evaporate salt layers has still been unrevealed,sulfate evaporate salt layers as oxidation barrierin porphyry ore mineralization role rarely reported. In this paper,sulfur isotope characteristics of porphyrite iron deposits have been studied in Middle-Lower Yangtze River Polymetallic Ore Belt,and evaporate salt layers oxidation barrier in porphyry ore mineralization role has been revealed. Porphyrite iron deposits and Fe-S deposits commonly contain gypsum,and iron deposits,Fe-S deposits and gypsum deposits are paragenesis closely. In these deposits,the values of sulfideδ34SV-CDTare abnormally high,and the average values are higher than 5‰. Most of the values of gypsum δ34SV-CDTare about 20‰,which are similar to the value of marine sulfate. Sulfur isotopic composition of the deposits is closely related with the genesis types,with the reduced sulfur isotope value from ore magma type to ore magma-hydrothermal type to hydrothermal type. Such as the values of sulfide δ34SV-CDTare 10. 8‰ from Gushan deposit,7. 85‰ from Meishan deposit and 5. 01‰ from Washan deposit. The variation of sulfur isotopic composition of the deposits is mainly controlled by the sulfate reduced temperature and the proportion of original magma sulfur. The higher sulfate reduced temperature is,the higher sulfide δ34S value is. And the higher proportion percent of the original magma sulfur is the lower sulfide δ34S value. The calculate results obtained that most of sulfur is derived from sulfates in evaporate salt layers,and the proportion is approximately 60% ~ 80%. The reduction temperature is more than 450℃. The temperature of the sulfide precipitation was lower and relatively later. Thus,we infer that evaporate salt layers not just provide a large number of agents of mineralization for the sodium alteration,scapolitization and skarn alteration,like Na+,Cl-,CO32-and so on,but also course the Fe2 +transport as the complex( e. g. Na-Fe-Cl). On the other hand,the evaporate salt layer is the most important oxidation barrier in the depth crust,which could oxidize the Fe2 +into Fe3 +in the silicate magma and hydrothermal solution,and enrich the iron to be the iron deposit. It is a critical factor of the ore-forming of the porphyrite iron deposit. While the magma is assimilating evaporate salt layers( CaSO4),SO42-oxidize Fe2 +into Fe3 +in the silicate melt,which prevent Fe2 +to enter the lattice silicate minerals,with forming Fe3O4/ Fe2O3and poor iron silicate minerals like diopside,actinolite,tremolite and so on. The immiscibility occurs between iron oxideand silicate melt in magma chamber,by the effects of P,NaCl and volatile,forming the iron ore magma. The iron ore magma has strong viscous behavior,with short migration distance,penetrating along favorable structural parts,near the contact zone of intrution and salt layers. It forms ore magma type or like-skarn type iron deposit like Gushan and Meishan deposits. Metallogenic hydrothermal has strong mobility,transporting in the form of iron complex,with long migration distance,concentrating and precipitating in the distal the contact zone of intrution and salt layers,like the volcanic rocks covering the subvolcanic rocks. These two type iron deposits coexist in the porphyrite iron deposit family with a certain spatial zonation,forming thedouble-metallogenic structure. In the contact zone of intrution and salt layers,there might present the Daye ore magma-skarn iron deposit,with high grade and high reserve,and the scale may exceed the iron deposit occurred in the shallow part of subvolcanic rocks or volcanic rocks. And,SO42-itself is reduced into S2-,while it is oxidizing the Fe2 +,and S2-combine with Fe2 +to form pyrite,in the top or side portion of the iron deposit. These are underlying reasons of paragenesis closely among iron deposits,Fe-S deposits and gypsum deposits." @default.
• W2376036222 created "2016-06-24" @default.
• W2376036222 creator A5003686569 @default.
• W2376036222 date "2014-01-01" @default.
• W2376036222 modified "2023-09-25" @default.
• W2376036222 title "Effect of sulfate evaporate salt layer for formation of porphyrite iron ores in the Middle-Lower Yangtze River area" @default.
• W2376036222 hasPublicationYear "2014" @default.
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