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首页> 外文期刊>Journal of Iberian geology >Mineral chemistry of late Variscan gabbros from central Spain: constraints on crystallisation processes and nature of the parental magmas
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Mineral chemistry of late Variscan gabbros from central Spain: constraints on crystallisation processes and nature of the parental magmas

机译：西班牙中部晚期瓦里斯卡长舌猴的矿物化学：结晶过程和父母岩浆性质的限制

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摘要

Major and trace element chemistry has been determined in the main minerals (olivine, orthopyroxene, clinopyroxene, plagioclase, amphibole, phlogopite) from the Talavera and La Solanilla gabbroic intrusions (Spanish Central System). The results show a heterogeneous mineral composition illustrative of the chemical evolution of calc-alkaline basic magmas during crystallization. The formation of incompatible element-rich interstitial minerals, such as amphibole, phlogopite and accessory phases (e.g., zircon, apatite), and the presence of zoning patterns in major minerals towards a more evolved composition, point to a progressive differentiation of the parental melt. The chemical variation depicted by trace elements usually incompatible with clinopyroxene (e.g., rare earth elements (REE), Th, Zr, Nb, Ti) implies co-precipitation with phases displaying a compatible behaviour with respect to these elements (e.g., apatite, zircon, amphibole). However, the very high LILE (large ion lithophile elements) and LREE (light REE) shown by clinopyroxene can not be explained exclusively by a closed-system in-situ crystallization process. Several features of the mineral chemistry (e.g. positive correlation of (La/Sm)N with La and Na in clinopyroxene and plagioclase, respectively) support the involvement of an external component (wall-rock assimilation or hybridization with an evolved melt). The petrography and mineral chemistry of the gabbros, in conjunction with bulk rock data from previous studies, favour a calc-alkaline affinity for the parental melts. Thus, metasomatism in the mantle sources related with this basic magmatism might be associated with recycling of crustal components during the Variscan orogeny.
机译：已经确定了塔拉维拉和拉索拉尼利亚辉长岩侵入体（西班牙中央系统）的主要矿物质（橄榄石，邻苯二茂铁，斜辉石，斜长石，斜闪石，金云母）中的主要和微量元素化学。结果表明，异质矿物成分说明了钙碱性碱性岩浆在结晶过程中的化学演化。富含不相容元素的间隙矿物的形成，例如闪石，金云母和副相（例如锆石，磷灰石），以及主要矿物中向着更演化的成分的分区模式的存在，表明母体熔体逐渐分化。痕量元素通常与clinopyroxene不兼容的化学变化（例如，稀土元素（REE），Th，Zr，Nb，Ti）意味着与这些元素（例如磷灰石，锆石）表现出兼容行为的相共沉淀，角闪石）。然而，不能通过封闭系统的原位结晶过程专门解释由次氯环己烯显示的非常高的LILE（大离子亲石元素）和LREE（轻稀土）。矿物化学的几个特征（例如（cl / pyrclase和（La / Sm）N与La和Na的正相关）分别支持外部成分的参与（壁-岩石同化或与析出的熔体杂交）。辉长岩的岩石学和矿物化学，再结合以前的研究中的大量岩石数据，都有助于钙碱性对亲代熔体的亲和力。因此，与这种基本岩浆作用有关的地幔源变质作用可能与瓦里斯卡造山运动中地壳成分的再循环有关。

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