Abstract：As a special kind of sedimentary structures,cone-in-cone,laminated cones consist of fiber-shaped minerals encased in a cone outlook, and has been the focus of intense study since 1990s. However,the research on the cone-in-cone in China started later,while the concomitant understanding is relatively poor. This paper aims to summarize and analyze in detail the morphology,strata occurrence,formation environment,composition of previously documented-laminated cones,combined with three undocumented outcrop examples in the Tuokexun sag,the east of Junggar Basin,and Hami Basin. The unique cone-in-cone structures were well developed in sedimentary sequences from the Paleoproterozoic to the Neogene,especially concentrated on late Paleozoic to Mesozoic practically. It is worth mentioning that cone-in-cone structures indeed developed particularly in Early Jurassic and Late Triassic or Triassic-Jurassic(T-J)boundary. Therefore, cone-in-cone structures may be related to mass extinctions. Moreover,cone-in-cone structures are seen to occur in both marine and non-marine settings, suggesting that ocean processes are not mandatory for the formation. Original biochemical action would be an explanation for cone-in-cone structures. However,the growth habits of fibrous minerals and the relationship between cone-in-cone structures and their environment and sequence need to be further documented.
Cao Mengchun,Zhong Jianhua,Liu Chuang et al. Features and genetic mechanism of cone-in-cone structures: Progress and examples[J]. JOPC, 2017, 19(6): 1049-1062.
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