Arclogites and their role in continental evolution; part 1: Background, locations, petrography, geochemistry, chronology and thermobarometry
Arclogites and their role in continental evolution; part 1: Background, locations, petrography, geochemistry, chronology and thermobarometry
复制标题
弧长岩及其在大陆演化中的作用；
DOI：
10.1016/j.earscirev.2020.103375
复制
发表时间：
2021
影响因子：
12.1
通讯作者：
Triantafyllou, Antoine
中科院分区：
文献类型：
--
作者：
Ducea, Mihai N.;Chapman, Alan D.;Bowman, Emilie;Triantafyllou, Antoine
本文和另一篇论文（Ducea et al., 2020）综述了安山岩大陆弧岩浆中含钛氧化物的弧长岩（或斜辉石、石榴石、角闪洞和feses单键）和碎屑（统称为残留物）。实验岩石学和岩石学观测表明，这些榴辉岩相岩石岩浆形成于地壳厚度超过35 ~ 40 km的弧下深部地壳热区。较细弧的火山和深成产物可以完全从角闪岩到麻粒岩相和无石榴石辉石岩残留物中提取出来。弧长岩最为人所知的可能是捕虏体，在年轻的（内华达山脉和亚利桑那州中部）和现代的（哥伦比亚）亚弧环境中都有明显的例子。我们怀疑弧长岩比目前在造山带和克拉通域的捕虏体记录中发现的更为普遍。在Kohistan弧最深处的暴露处也发现了离散的弧长岩，在构造暴露的橄榄岩块中也发现了小体积包裹体（如摩洛哥的Beni Bousera）。地球化学上，这些岩石是低硅石（SiO2< 50%）组合，具有低Nb/Ta和Sr/Y比值，富集重稀土元素，因此它们代表了构成大多数弧表面火山岩和岩基的安山岩-英英质液体的补充。实际上，弧长岩中所有形成岩石的矿物的密度都与下面的地幔相似或更大，这使它们成为沉没的理想候选者。弧长岩形成于35-70 公里深的弧底地壳中，形成时的高温（~ 800-1000 °C），如果它们长时间附着在地壳上，就会在~ 650-750 °C时冷却和变质。这些岩石的年龄可以通过单键nd和单键dhf石榴石等时年代学以及钛矿或金红石等时年代学得到，尽管这些年龄可以通过长期储存在热的下地壳环境中来重置。最近在弧长岩中发现的锆石辅助矿物使这些岩石的年代测定精度更高，并且更有可能使用单键dpb年代学来保存结晶年龄。
Arclogites, or clinopyroxene-, garnet-, amphibole-, and Fesingle bondTi oxide-bearing cumulates and restites (collectively representing residues) to andesitic continental arc magmas, are reviewed here and in a companion paper (Ducea et al., 2020). Experimental petrology and petrologic observations suggest that these eclogite facies rocks form magmatically in deep crustal hot zones beneath arcs with crustal thicknesses exceeding 35–40 km. Volcanic and plutonic products of thinner arcs may instead be entirely extracted from amphibolite to granulite facies and garnet-free pyroxenite residues. Arclogites are perhaps best known as xenoliths, with notable examples from young (Sierra Nevada and Central Arizona) and modern (Colombia) sub-arc environments. We suspect that arclogite occurs more commonly than currently recognized in the xenolith record from orogenic and cratonic domains. Arclogite is also found as discrete intervals in the deepest exposures of the Kohistan arc and as small volume inclusions in tectonically exposed peridotite massifs (e.g., Beni Bousera, Morocco). Geochemically, these rocks are low silica (SiO2< 50%) assemblages with low Nb/Ta and Sr/Y ratios and enrichments in heavy REEs such that they represent the complement to the andesitic-dacitic liquids that make up the surface volcanics and batholiths of most arcs. Virtually all rock-forming minerals in arclogites are of similar or greater density than the underlying mantle, making them ideal candidates for foundering. Arclogites are formed in the lowermost crust of arcs at 35–70 km depth and record high temperatures (~800–1000 °C) at the time of formation which then cool and metamorphose at ~650–750 °C if they remain attached to the crust for an extended period of time. Ages of these rocks are obtainable by Smsingle bondNd and Lusingle bondHf garnet isochron geochronology as well as titanite or rutile Usingle bondPb geochronology, although these ages can be reset through long-term storage in hot lower crustal environments. Recent discovery of zircon accessory minerals in arclogites makes these rocks datable with greater precision and greater chance of preserving crystallization ages by Usingle bondPb chronology.
登录
查看更多内容
根据镁铁质麻粒岩的 Sm-Nd 测年推断科希斯坦岛弧 Jijal 杂岩岩浆和变质事件的时间
DOI：
--
发表时间：
2000
期刊：
Geological Society Special Publication
影响因子：
--
作者：
H. Yamamoto;E. Nakamura
通讯作者：
E. Nakamura
影响因子：
3.9
作者：
Elkins-Tanton, Linda T.
通讯作者：
Elkins-Tanton, Linda T.
亚利桑那州中部下地壳演化：来自 Camp Creek 镁铁质捕虏体的 Sr、Nd 和 Pb 同位素和地球化学证据
影响因子：
5.3
作者：
S. Esperança;R. Carlson;S. Shirey
通讯作者：
S. Shirey
影响因子：
5.3
作者：
Balica, C.;Ducea, M. N.;Petrescu, L.
通讯作者：
Petrescu, L.
影响因子：
18.3
作者：
Dhuime, Bruno;Wuestefeld, Andreas;Hawkesworth, Chris J.
通讯作者：
Hawkesworth, Chris J.