Compared to Group 1 basalts, the Group 2 basalts in the Northern Tarim Uplift showa clear depletion in the heavy rare-earth elements (beneath the OIB in the lower rightspidergram in Fig. 3.4) and they have higher Nb/Yb ratios (≥15) that approach thoseof O...[继续阅读]

    One notable feature of the Tarim Block is the wide occurrence of the EarlyPermian intraplate magmatism (Fig. 1.7 and Fig. 1.8), and the magmatic rockswere constituted mainly of basaltic rocks including basalts, diabase, basalticandesite, ultramafic rocks,...[继续阅读]

    Giant radiating dike swarms can be attributed to mantle plumes. The Mackenzieswarm in Canada (a giant radiating swarm covering 100° of azimuth), the CentralAtlantic reconstructed swarm (a 360° giant radiating swarm), the Matachewanswarm in Canada (deforme...[继续阅读]

    Abundant Fe–Ti oxides in the mafic–ultramafic rocks may be an indicator of Fe–Ti-rich magmas parental to the Wajilitag deposit. The parental magma compositionof the intrusion has been recalculated by the olivine–liquid Fe–Mg exchangeequilibrium. The FeO/M...[继续阅读]

    Though most of the findings agree well with the geodynamic model suggestedin this chapter, there are inevitably more or fewer facts that do not seem exactlysupportive of the model or even controversial to it. These facts are also embodiedin some specific ...[继续阅读]

    Generally, the various Tarim LIP rocks together cover a large range of SiO2 (Fig.3.2) from less than 45 wt.% (ultramafic rocks) to larger than 65 wt.% (felsic rocks).Like many other LIPs around the world, the intermediate rocks (e.g., andesite ordiorite) ...[继续阅读]

    Abstract: The Wajilitag Fe–Ti–V oxide deposit is the only ore body that is being mined inthe Tarim LIP. It was probably formed by a slowly cooling magmatic crystallization froma deep magma chamber. Fe–Ti oxides therein were formed by two stages of fractio...[继续阅读]

    The proposal of this model is inspired by Turner’s contribution regarding twotypes of LIP petrogenesis, i.e. the Parana Pattern for partial melting of thelithospheric mantle and the Deccan Pattern for the partial melting of the mantleplume (Turner et al.,...[继续阅读]

    Since the late Middle Neoproterozoic, the Tarim Block has become a stableplatform overlain by late Middle Neoproterozoic to Cambrian unmetamorphosedcover sequences (Fig. 1.4). The late Middle to Late Neoproterozoic sequencesare called the Nahua and Sinian...[继续阅读]

    The Wajilitag layered mafic–ultramafic intrusion, as an important lithologicalunit of the Tarim LIP, was located in the southeastern part of Bachu Countyin the western Tarim Basin (Fig. 2.1). It consists mainly of olivine pyroxenite,pyroxenite and gabbro ...[继续阅读]