| Автор | HOU, MING-LAN |
| Автор | JIANG, YAO-HUI |
| Автор | JIANG, SHAO-YONG |
| Автор | LING, HONG-FEI |
| Автор | ZHAO, KUI-DONG |
| Дата выпуска | 2007 |
| dc.description | Two suites of granitoids, the Late Jurassic (158 ± 3 Ma) Linglong suite and the Early Cretaceous (130–126 Ma) Guojialing suite, crop out in the northwestern Jiaodong Peninsula, eastern China. The Linglong suite is a monzogranite, comprising alkali feldspar, plagioclase, quartz and Fe-rich biotite. The Guojialing suite includes at least five plutonic bodies of both granodiorite and monzo-granite. The rocks are composed of plagioclase, alkali feldspar, quartz, Mg-rich amphibole and Mg-rich biotite. Both the Linglong and Guojialing suites have adakitic affinity. They are enriched in LREE with high La/Yb ratios and show positive Eu anomalies. The rocks are also enriched in LILE and depleted in HFSE with high Sr/Y ratios. The Linglong granite shows very uniform Sr–Nd isotopic compositions with initial <sup>87</sup>Sr/<sup>86</sup>Sr ratios of 0.7119–0.7126 and ϵNd (T) values of −21.3 to −21.6, which are similar to those of the local Neoarchaean basement. The Guojialing suite has variable initial <sup>87</sup>Sr/<sup>86</sup>Sr ratios (0.7108–0.7120) and ϵNd (T) values (−10.8 to −17.2), which are distinct both from those of the Neoarchaean basement and from those of the local enriched lithospheric mantle inferred from the coeval mafic dykes in the studied area. Detailed petrological and geochemical data indicate that the Linglong suite was derived by partial melting of Neoarchaean metamorphic lower-crustal rocks at depth of > 50 km with a eclogite residue, whereas the Guojialing suite was formed by the reaction of delaminated eclogitic crust-derived melt with the upwelling asthenospheric mantle. The petrogenesis of these two contrasting adakitic granitoids suggests intensive lower-crustal delamination during Early Cretaceous times, following a crustal thickening process from the late stage of the Early Jurassic to early stage of the Late Jurassic with crustal thickness of < 32 km to > 50 km, respectively. |
| Издатель | Cambridge University Press |
| Тема | granitoid |
| Тема | adakite |
| Тема | crustal thickening |
| Тема | delamination |
| Тема | Jiaodong Peninsula |
| Название | Contrasting origins of late Mesozoic adakitic granitoids from the northwestern Jiaodong Peninsula, east China: implications for crustal thickening to delamination |
| DOI | 10.1017/S0016756807003494 |
| Electronic ISSN | 1469-5081 |
| Print ISSN | 0016-7568 |
| Журнал | Geological Magazine |
| Том | 144 |
| Первая страница | 619 |
| Последняя страница | 631 |
| Аффилиация | HOU MING-LAN; Nanjing University; Shandong Bureau of China Exploration and Engineering Bureau |
| Аффилиация | JIANG YAO-HUI; Nanjing University; |
| Аффилиация | JIANG SHAO-YONG; Nanjing University |
| Аффилиация | LING HONG-FEI; Nanjing University |
| Аффилиация | ZHAO KUI-DONG; Nanjing University |
| Выпуск | 4 |
