中文摘要：

北方中国块(网络控制块) 经历了广泛的 lithospheric 在中生代变瘦和随后的披风生长到新生代，而是他们的机制遗体争论。这份报纸在从 Junan 和 Qingdao 在迟了的白垩纪暗岩招待的披风捕虏体在橄榄石 xenocrysts 和 porphyroclastic 橄榄石上在化学的 situ 和氧同位素分析报导， Sulu orogen。结果证明所有这些橄榄石相对正常披风橄榄岩有低 18O 价值。从 Junan 的橄榄石 xenocrysts 和 porphyroclastic 橄榄石有 Fo=87.589.8，有 4.8 的一般水准的 18O=4.15.2；从 Qingdao 的 porphyroclastic 橄榄石也有 Fo=89.089.9，有 4.8 的一般水准的 18O=4.15.2。这些橄榄岩捕虏体有类似于最新增大的MORB类型披风的 petrological 和 geochemical 亲密关系，我们因此认为这低-- 18O 在橄榄石展示从是 metasomatized 由的披风楔继承融化源于 subducted 海洋的外壳，它经历了高温度的热水的改变获得低-- 18O 签名。联合了新生代的存在低 -- 18O 暗岩和石榴石辉岩捕虏体(再循环的海洋的外壳的寡妇) 在 NCB，在新生代暗岩招待了海洋的外壳多半玩了的 subducted 在 NCB 的 lithospheric 进化的一个重要角色在到新生代的中生代期间。

英文摘要：

The North China Block （NCB） experienced extensive lithospheric thinning and subsequent mantle accretion in the Mesozoic to Cenozoic, but their mechanism remains controversial. This paper reports in situ chemical and oxygen isotope analyses on olivine xenocrysts and porphyroclastic olivines in mantle xenoliths hosted in the late Cretaceous basalts from Junan and Qingdao, the Sulu orogen. The results show that all these olivines have low δ^18O values relative to normal mantle peridotite. The olivine xeno- crysts and porphyroclastic olivines from Junan have Fo=87.5-89.8, δ^18O=4.1‰-5.2‰ with an average of 4.8‰; the porphy- roclastic olivines from Qingdao also have Fo=89.0-89.9, δ^18O=4.1‰-5.2‰ with an average of 4.8‰. These peridotite xenoliths have petrological and geochemical affinities similar to newly accreted MORB-type mantle, we hence consider such low-δ^18O features in the olivines to inherit from a mantle wedge that was metasomatized by melts derived from the subducted oceanic crust, which had experienced high-temperature hydrothermal alteration to acquire the low-δ^18O signatures. Combined the existence of Cenozoic low-δ^18O basalts and garnet pyroxenite xenoliths （relicts of recycled oceanic crust） hosted in Cenozoic basalts in the NCB, the subducted oceanic crust likely played an important role in the lithospheric evolution of the NCB during the Mesozoic to Cenozoic.