Evolution of exhumation and erosion in western West Gondwanaland as recorded by detrital zircons of late Neoproterozoic and Cambrian sedimentary rocks of NW and Central Argentina
Evolution of exhumation and erosion in western West Gondwanaland as recorded by detrital zircons of late Neoproterozoic and Cambrian sedimentary rocks of NW and Central Argentina
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阿根廷西北部和中部新元古代晚期和寒武纪沉积岩碎屑锆石记录的西冈瓦纳大陆西部折返和侵蚀演化
DOI：
10.1007/s00531-010-0559-5
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发表时间：
2010
影响因子：
2.3
通讯作者：
Toselli A.J.
中科院分区：
文献类型：
--
作者：
Miller;Adams Ch;Acenolaza;Toselli A.J.
晚新元古代，寒武纪和早奥陶世沉积和变质沉积岩的阿根廷中北部和西北部的物源区的演化进行了讨论，使用123个最大年龄的碎屑锆石从42个样本，从这个和以前发表的研究。大多数碎屑锆石年龄可分为1200 -900 Ma和670-545 Ma两组。这些年龄基本上是相同的非非常低级变质晚新元古代早寒武世Puncoviscana组和低到高级变质岩石的东Sierras Pampeanas。因此，这两个单元在同一沉积时期与相似的物源区有关。锆石从在地壳中结晶到折返和侵蚀的时间跨度可能很长。这在确定沉积岩的最大年龄时很重要。锆石最大值的变化也可能受到拟定物源区的同期沉积物覆盖层的影响。对于中元古代晚期至新元古代早期的锆石年龄组，巴西Sunsás造山带西南部的活动山脉是最可能的源区。较年轻的新元古代晚期锆石与巴西西南部和中南部的Brasiliano造山带不断发展的山脉有关。年轻的锆石，高达514马，从化石轴承Puncoviscana和Suncho组露头有关的晚早寒武世火山活动同期沉积。这种情况在晚寒武世至早奥陶纪持续存在，但孙萨斯造山带的物源逐渐减少，而拉普拉塔克拉通的起源则变得重要起来。
The evolution of the provenance areas for Late Neoproterozoic, Cambrian and Early Ordovician sedimentary and meta-sedimentary rocks of north central and northwest Argentina is discussed using 123 maximum ages of detrital zircons from 42 samples from this and previously published studies. Most detrital zircon ages fall into two groups: 1,200–900 Ma and 670–545 Ma. These ages are essentially identical for the non- to very low grade metamorphic late Neoproterozoic to Early Cambrian Puncoviscana Formation and the low to high grade metamorphic rocks of Eastern Sierras Pampeanas. Hence, both units are related to similar provenance areas at the same time of sedimentation. The time span from zircon crystallization in the Earth’s crust to exhumation and erosion may be very long. This is important when determining maximum ages of sedimentary rocks. Variation of zircon maxima may also be influenced by concurrent sedimentary cover of proposed provenance areas. For the late Mesoproterozoic to early Neoproterozoic zircon age group, an active mountain range of the southwest Brazilian Sunsás orogen is the most probable provenance area. The younger, late Neoproterozoic zircons are related to the continuously developing mountains of the Brasiliano orogen of southwest and south central Brazil. Young zircons, up to 514 Ma, from fossil-bearing Puncoviscana and Suncho Formation outcrops are related to late Early Cambrian volcanism contemporaneous with sedimentation. This situation continues through the Late Cambrian to the Early Ordovician, but the Sunsás orogen provenance diminishes as possible Río de la Plata craton origins become important.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1144/gsl.sp.1998.142.01.13
发表时间：
1998
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
J. P. Sims;T. Ireland;A. Camacho;P. Lyons;P. Pieters;R. Skirrow;P. Stuart;R. Miró
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影响因子：
3.8
作者：
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通讯作者：
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影响因子：
1.5
作者：
S. Finney;S. Peralta;G. Gehrels;K. Marsaglia
通讯作者：
K. Marsaglia