Relative dating geology
Although such slides don't occur very often, says Urlaub, their size makes them quite significant.
Molybdenite Re–Os age of the skarn type mineralization is 83.4 ± 2.1 Ma, and the stratiform ores hosted by basalt is 84.2 ± 7.3 Ma, which are consistent with the LA-ICP-MS zircon age of the Xinshan granite intrusion (83.1 ± 0.4 Ma).
The evidence listed above reflects the fact that different ore styles in the Kafang deposit belong to the same mineralization system.
Major ore minerals are chalcopyrite, pyrrhotite, cassiterite, pyrite and scheelite.
Sulfur and Pb isotopic components hint that the sources of different types of mineralization are distinctive, and indicate that the skarn ore mainly originated from granitic magma, whereas the basalt-hosted Cu ores mainly derived from basalt.
The smoking -- or in this case, oozing -- gun is a layer of siliceous microfossils called diatoms.
Kafang is one of the main ore deposits in the world-class Gejiu polymetallic tin district, SW China.
Together, these data revealed diatom-rich layers, up to ten meters thick, that traced directly from the core to the base of slide layers within the mega-slide complex.The Biggest Landslides on Earth Caused by Very Tiny Organisms The biggest landslides on Earth aren't on land, but on the seafloor.These mega-slides can move thousands of cubic kilometers of ma..."One-fifth of all tsunamis may be caused by undersea mega-slides," she says.If diatom layers are a major factor, then understanding where paleoclimate conditions may have favored diatom growth might help reveal potential mega-slide sites.And some scientists speculate that the 2011 Tohoku tsunami in Japan may have been amplified by a submarine mega-slide.