BROMIDE GEOCHEMISTRY OF SOME NON-MARINE SALT DEPOSITS IN THE SOUTHERN GREAT BASIN
BROMIDE GEOCHEMISTRY OF SOME NON-MARINE SALT DEPOSITS IN THE SOUTHERN GREAT BASIN
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2014
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在Searles湖的威斯康星州上盐和下盐通常含有约50 ppm的溴，相比之下，在Searles的早更新世至晚更新世混合层和相关的盐在Panamint谷的平均值为20 ppm。混合层单元C中的高溴化物表明至少有一个干燥期。上新世处女谷和阿瓦瓦茨山盐岩中的溴化物含量为6至10 ppm。这个低的范围是一致的，从古老的海洋盐岩侵蚀从科罗拉多高原的祖先科罗拉多河的衍生。威斯康星州的盐在Searles积累的速度可能与欧文斯河中最近的氯化物通量一致，但这些速率是目前整个欧文斯河流域氯化物输入量的几倍，包括大气降水和温泉的小贡献。这些卤化物可能存在于上新世的沉积物中，如Waucobi-Coso湖床。关于这一地区上新世地理的各种证据表明，沃库比-科索沉积物也可能通过向西流动的河流或向西移动的天气系统从东部的海相碳酸盐来源中接受了一些卤化物。
The Wisconsin Upper Salt and Lower Salt in Searles Lake regularly contain about 50 ppm Br, compared to a mean of 20 ppm in the Early to Late Pleistocene Mixed Layer in Searles and the correlative salt in Panamint Valley. At least one period of dessication is suggested by high bromide in unit C of the Mixed Layer. Bromide in both the Pliocene Virgin Valley and Avawatz Mountain salt rocks is 6 to 10 ppm. This low range is consistent with derivation from older marine salt rocks eroded from the Colorado Plateau by an ancestral Colorado River. The Wisconsin salts at Searles accumulated at a rate possibly consistent with the recent flux of chloride in the Owens River, but these rates are several times the present input of chloride into the entire Owensdrainage, including atmospheric precipitation and a small contribution from thermal springs. The halides may have been held over in Pliocene sediments such as the Waucobi-Coso lake beds. Various lines of evidence about Pliocene geography of this area admit the possibility that the Waucobi-Coso sediments may also have received some of their halides from an eastern source of marine evaporites either by a westward-flowing river or by westward-moving weather systems.