TY  - JOUR
AU  - Min, M.
AU  - Chen, J.
AU  - Wang, J.
AU  - Wei, G.
AU  - Fayek, M.
PY  - 2005//
TI  - Mineral paragenesis and textures associated with sandstone-hosted roll-front uranium deposits, NW China
JO  - Ore Geology Reviews
SP  - 51
EP  - 69
VL  - 26
IS  - 1
KW  - China
KW  - Mineralogy
KW  - Paragenesis
KW  - Sandstone-hosted roll-type uranium deposit
N2  - We present a first paragenetic study of the Wuyier, Wuyisan, Wuyiyi and Shihongtan sandstone-hosted roll-front uranium deposits, northwest China. The mineralization is hosted by Lower–Middle Jurassic coarse- to medium-grained sandstones, which are dark-gray to black due to a mixture of ore minerals and carbonaceous debris. The sandstone is alluvial fan-braided river facies. Minerals associated with these deposits can be broadly categorized as detrital, authigenic, and ore-stage mineralization. Ore minerals consist of uraninite and coffinite. This is the first noted occurrence of coffinite in this type of deposit in China. Sulfide minerals associated with the uranium minerals are pyrite, marcasite, and less commonly, sphalerite and galena. The sulfide minerals are largely in textural equilibrium with the uranium minerals. However, these sulfide minerals occasionally appear to predate, as well as postdate, the uranium minerals. This implies that there are multiple generations of sulfides associated with these deposits. The ore minerals occur interstitially between fossilized wood cells in the sandstones as well as replace fossilized wood and biotite. The deposits are generally low-grade. Primary uranium minerals associated with the low-grade deposits are generally too small, ranging from 0.2 to 0.3 μm in diameter, to be observed by optical microscopy and are only observed by electron microscopy. Mineral paragenesis and textures indicate that these deposits formed under low temperature (30–50 °C) conditions.
SN  - 0169-1368
UR  - https://www.sciencedirect.com/science/article/pii/S0169136804000459
N1  - exported from refbase (http://www.uhydro.de/base/show.php?record=175), last updated on Fri, 26 Jan 2024 13:19:04 +0100
ID  - Min_etal2005
ER  -