Cretaceous Sinters Heilongjiang Province, NE, China
Sipingshan and Daiwanglazi Gold Mines in Heilongjiang Province occur on
hill tops that are capped with thick sinter deposits that are in places
8-10 m thick.
Mining activity has removed much of the sinters although
extensive in situ remnants occur at both localities.
Laminated sinter apron chert textures dominate at the two sites and
fossil plants are sparse and difficult to spot. Three main chert fabrics
are present; finely laminated cherts, some with bedding parallel vuggy
porosity, suggest areas of apron proximal to hot spring vents, thicker
bedded cherts with vertical microbial fabrics suggest more distal cooler
apron areas. Sparse blocks of mottled to massive chert appear to
represent apron margins.
Detail from image above showing vertical fabric created by silicification of thick microbial mat.
Chert block with bedding parallel porosity
chert texture at Sipingshan Mine, Alternations of dark (organic-rich)
chert and lighter cleaner chert. Lamination is horizontal but there is
significant topography suggesting the presence of micro-terraces and