Texture–Temperature–Geochemistry Relationships in the Upper Mantle as Revealed from Spinel Peridotite Xenoliths from Wangqing, NE China
Texture–Temperature–Geochemistry Relationships in the Upper Mantle as Revealed from Spinel Peridotite Xenoliths from Wangqing, NE China
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DOI：
10.1093/petroj/39.3.469
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发表时间：
1998-03
影响因子：
3.9
通讯作者：
Yigang Xu;M. Menzies;P. Vroon;J. Mercier;Chuan-yong Lin
中科院分区：
文献类型：
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作者：
Yigang Xu;M. Menzies;P. Vroon;J. Mercier;Chuan-yong Lin
摘要汪清尖晶石橄榄岩捕虏体的形成是由于晶界迁移和重结晶作用的增强，同时表现出结构和地球化学的耦合变化。在中生代晚期以来岩石圈结构、温度、地球化学和剥蚀等热相关变化过程中，造山带的同位素组成发生了变化。原粒橄榄岩和过渡橄榄岩比等粒橄榄岩更少地作为岩石圈的基础，这些橄榄岩主要是汪清橄榄岩，流变学上类似于热方辉橄榄岩和单斜辉石贫乏的二辉橄榄岩。变形harz边界层，使它能够侵入与软流圈辉橄榄岩和二辉橄榄岩是富轻稀土diapirically刚性最上部岩石圈地幔在同一时间刚刚元素（LREE），和Ce/Yb-MgO的变化表明，这些主机玄武岩喷发前。富含橄榄石的岩石优先被交代剂渗透。来自肥沃原颗粒岩和过渡型二辉橄榄岩的单斜辉石具有高Nd/Nd（eNd= 10-18）和低Sr/ Sr（0·7020-0·7036），与长期累积亏损（>1·34戈伊）相一致。相比之下，单斜辉石在大多数
enhanced grain boundary migration and recrystallization, giving rise Spinel peridotite xenoliths from Wangqing, NE China, exhibit to coupled textural and geochemical variations. During the thermal correlated variations in texture, temperature, geochemistry and raerosion of the lithosphere that took place since the late Mesozoic, diogenic isotopes. Protogranular and transitional peridotites are less the base of lithosphere represented by the precursor rocks of the refractory than equigranular samples, which are predominantly Wangqing peridotites became rheologically similar to the thermal harzburgites and clinopyroxene-poor lherzolites. Deformed harzboundary layer such that it was able to intrude with the asthenosphere burgites and lherzolites are variably enriched in light rare earth diapirically the rigid uppermost lithospheric mantle at a time just elements (LREE), and Ce/Yb–MgO variations indicate that these before the host basalt eruption. olivine-rich rocks have been preferentially infiltrated by metasomatic agents. Clinopyroxenes from the fertile protogranular and transitional lherzolites have high Nd/Nd (eNd= 10–18) and low Sr/ Sr (0·7020–0·7036) consistent with long-term time-integrated depletions (>1·34 Gy). By contrast, clinopyroxenes in the majority