Early Mesoproterozoic evolution of midcontinental Laurentia: Defining the geon 14 Baraboo orogeny
Early Mesoproterozoic evolution of midcontinental Laurentia: Defining the geon 14 Baraboo orogeny
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劳伦大陆中部早中元古代演化：定义geon 14 Baraboo造山运动
DOI：
10.1016/j.gsf.2021.101174
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发表时间：
2021
影响因子：
8.9
通讯作者：
Reiners, Peter W.
中科院分区：
文献类型：
--
作者：
Medaris, L. Gordon;Singer, Brad S.;Jicha, Brian R.;Malone, David H.;Schwartz, Joshua J.;Stewart, Esther K.;Van Lankvelt, Amanda;Williams, Michael L.;Reiners, Peter W.
新的地质年代学数据表明，1476-1470马沃尔夫河花岗岩基的侵位不是一个孤立的岩浆事件，但伴随着区域变质，变形和沉积。这种变质和变形的证据最好见于Baraboo间隔的硅质沉积岩中，这些沉积岩紧随1.65-1.63 Ga Mazatzal造山带。在巴拉布区间地层中，平行于板岩劈理的白云母、热液脉、石英岩角砾岩和变质古土壤中的40 Ar/39 Ar坪年龄为1493-1465 Ma。碎屑独居石上新生变晶增生的U-Th-总Pb年龄为1488 ± 20 Ma，褶皱变岩中重结晶赤铁矿的U-Th-总Pb年龄为1411 ± 39 Ma。后Baraboo，长石多成分砾岩，其中包含碎屑锆石的最小峰值年龄为1493马，被侵入的1470马花岗斑岩在沃尔夫河岩基的东北边缘。这一幕岩浆活动、区域变形和变质作用以及沉积作用在此被称为巴拉布造山带，它提供了一个连接西南部的皮库里斯造山带和东北部的平韦尔造山带的中陆连接带，完成了沿劳伦大陆南缘沿着5000 km的中元古代早期（卡雷期）造山作用。这条横贯大陆的造山带在前寒武纪造山带中是独一无二的，它的宽度很大（~1600 km），主要是由下地壳部分熔融形成的铁质花岗岩，并普遍发生与中地壳和上地壳花岗岩岩浆对流加热有关的区域性高温高压变质作用。
New geochronologic data from midcontinental Laurentia demonstrate that emplacement of the 1476–1470 Ma Wolf River granitic batholith was not an isolated igneous event, but was accompanied by regional metamorphism, deformation, and sedimentation. Evidence for such metamorphism and deformation is best seen in siliciclastic sedimentary rocks of the Baraboo Interval, which were deposited closely following the 1.65–1.63 Ga Mazatzal orogeny. In Baraboo Interval strata, muscovite parallel to slatey cleavage, in hydrothermal veins, in quartzite breccia, and in metamorphosed paleosol yielded40Ar/39Ar plateau ages of 1493–1465 Ma. In addition, U–Th–total Pb dating of neoblastic overgrowths on detrital monazite gave an age of 1488 ± 20 Ma, and recrystallized hematite in folded metapelite gave a mean U/Th–He age of 1411 ± 39 Ma. Post-Baraboo, arkosic polymictic conglomerate, which contains detrital zircon with a minimum peak age of 1493 Ma, was intruded by a 1470 Ma granite porphyry at the northeastern margin of the Wolf River batholith. This episode of magmatism, regional deformation and metamorphism, and sedimentation, which is designated herein as the Baraboo orogeny, provides a midcontinental link between the Picuris orogeny to the southwest and the Pinware orogeny to the northeast, completing the extent of early Mesoproterozoic (Calymmian) orogenesis for 5000 km along the southern margin of Laurentia. This transcontinental orogen is unique among Precambrian orogenies for its great width (~1600 km), the predominance of ferroan granites derived from partial melting of lower continental crust, and the prevalence of regional high T-P metamorphism related to advective heating by granitic magmas emplaced in the middle to upper crust.
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影响因子：
4.9
作者：
J. Amato;A. O. Boullion;Antonio M. Serna;A. E. Sanders;G. L. Farmer;G. Gehrels;J. Wooden
通讯作者：
J. Amato;A. O. Boullion;Antonio M. Serna;A. E. Sanders;G. L. Farmer;G. Gehrels;J. Wooden
影响因子：
1.8
作者：
Freiburg, Jared T.;Holland, Mark E.;Malone, Shawn J.
通讯作者：
Malone, Shawn J.
影响因子：
3.8
作者：
L. Medaris;S. Driese;G. Stinchcomb
通讯作者：
L. Medaris;S. Driese;G. Stinchcomb
地球化学和 Hf-Nd 同位素对美国明尼苏达河流域太古代岩石地壳演化的限制
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
A. Satkoski;M. Bickford;S. Samson;R. L. Bauer;Paul A. Mueller;G. Kamenov
通讯作者：
G. Kamenov
影响因子：
1.4
作者：
H. Williams
通讯作者：
H. Williams