Low temperature ore\|forming fluid is generally sulfate brine and mainly contains sulfate with Ba 2+ , Sr 2+ , Ca 2+ , and this type of fluid widely occurs in all kinds of environment in sea facies and continental facies.
There are obvious differences between two analytical methods named classic sequence stratigraphy and Cross' high-resolution sequence stratigraphy on identification method, applicability, inner structure and the knowledge of formation distribution of the sequence in the terrestrial rift basin.
The paper describes the isotopic characters of hydrogen, oxygen, sulfur, and fluid inclusion characters in geology, and discusses the metallogeny, metallogenic regularities and prospecting indicators for subvolcanic copper-silver-gold-lead-zinc polymetallic deposits in the Mesozoic terrestrial volcanic region of east China.
According to the facies migration characteristics and superimposing patterns of system tracts in the reference well, the standards for identifying two types of terrigenous sequences (type Ⅰand Ⅱ) and for their system tracts have been established.
The grain size and element (including redox sensitive elements and terrigenous elements) concentration of surface sediments from the Changjiang Estuary hypoxia zone and its adjacent sea area were measured in this research.
The organic matter sources are dominated by marine input in the silt flat, artemisia schrenkiana flat, and the transition zone between silt and spartina alterniflora flat, and are controlled by terrigenous input in spartina alterniflora flat.
Certified reference materials of bottom sediments-terrigenous clay (SDO-1), volcanic-terrigenous mud (SDO-2), and lime mud (SDO-3)-were used as model samples.
The low quality of OM is partly related to its intense anaerobic decomposition in anoxic environments with terrigenous sedimentation.
The Nile River plays the leading role in terrigenous sedimentation in the southeastern Mediterranean, especially in deep-sea areas.