Pyrite Framboids and Palaeo ocean Redox Condition Reconstruction
Received date: 2010-09-01
Revised date: 2010-11-02
Online published: 2011-05-10
Framboidal pyrites are denselypacked, raspberrylike, spherical aggregates of equigranular, micronsized crystals or microcrysts. Because of the difference principle in framboidal pyrites formation between oxic and euxinic depositional conditions, size distribution of framboids is indicative of oxygen levels for palaeo-ocean water column. However, only oxic and euxinic conditions can be definitely distinguished but suboxic or ferruginous conditions (anoxic and containing dissolved Fe2+) using the framboidal pyrites, and framboids formed in ferruginous condition may indicate euxinic environment. Therefore, incompatible results for deepwater redox conditions of the terminal Ediacaran Nanhua Basin have been achieved using framboidal pyrites size statistics and other available methods, respectively. We consider that the euxinic deepwater condition implied by framboids was incorrect, and the small pyrites may be formed due to limited sulfate concentrations in the basin and accordingly little H2S supply. In order to get credible results, other proxies, such as iron species, redox sensitive trace elements and stable isotope methods should be applied simultaneously when using framboidal pyrites to reconstruct palaeoocean environments.
Key words： Framboidal pyrite; Redox conditions; Palaeo ocean
Chang Huajin, Chu Xuelei . Pyrite Framboids and Palaeo ocean Redox Condition Reconstruction[J]. Advances in Earth Science, 2011 , 26(5) : 475 -481 . DOI: 10.11867/j.issn.1001-8166.2011.05.0475
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