Laterally continuous dark and orange microlaminations are observed in rock varnish from the northern Tianshan, Xinjiang. Microprobe chemical analyses indicate that dark layers in the varnish are rich in Mn and orange ...Laterally continuous dark and orange microlaminations are observed in rock varnish from the northern Tianshan, Xinjiang. Microprobe chemical analyses indicate that dark layers in the varnish are rich in Mn and orange layers are poor in Mn. Microscopic examinations of varnish ultra-thin sections reveal a lamination pattern that is regionally consistent and comparable. Based on geomorphic age control, the Holocene varnish lamination sequence is tentatively established and its paleoclimatic implications are explored within the framework of existing paleoclimatic data in the region.展开更多
文摘Laterally continuous dark and orange microlaminations are observed in rock varnish from the northern Tianshan, Xinjiang. Microprobe chemical analyses indicate that dark layers in the varnish are rich in Mn and orange layers are poor in Mn. Microscopic examinations of varnish ultra-thin sections reveal a lamination pattern that is regionally consistent and comparable. Based on geomorphic age control, the Holocene varnish lamination sequence is tentatively established and its paleoclimatic implications are explored within the framework of existing paleoclimatic data in the region.
