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The Mineralogical Characteristics of Pyrite at 26°S Hydrothermal Field, South Mid‐Atlantic Ridge
Author(s) -
LI Tao,
YANG Yaomin,
WANG Guozhi,
FAN Lei,
WANG Cheng,
LI Bing
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12369_18
Subject(s) - china , geology , oceanography , marine geology , ridge , state (computer science) , geochemistry , archaeology , geography , paleontology , algorithm , computer science
The pyrite in 26°S can be classified into four distinct types: Type-I occurs as colloform texture and show banded and circled characteristics. It has the lowest reflectivity, and always co-existing with Type-II. Type-II occurs as anhedral texture with poor crystallization degree and porous. They all show aggregate structure and assemble with Type-I. Type-III occurs as subhedral-euhedral cubic crystals, always occupy in the margin of the aggregation of Type-I and Type-II. Its’ optic character was similar to Type-II. Type-IV occurs as euhedral cubic crystals with larger grain than Type-III and co-existed with chalcopyrite. These pyrites always occupy in the fissures and pores of the aggregation of Type-I and Type-II. Type-I → Type-II → Type-III represent the different crystallinity of the same hydrothermal mineralization stage. Abundant pores and fissures can be found in the aggregate of first stage pyrite. Type-IV, occupying in these fissures and pores and co-existing with chalcopyrite, represents the later hydrothermal mineralization stage.