早白垩世玄武岩含磷灰石幔包体：华北克拉通东部地球化学修正与碳循环意义

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Asian Earth Sciences Pub Date : 2025-04-05 DOI:10.1016/j.jseaes.2025.106596

Nongxin Yuan , Cheng Xu , Zhuoqi Li

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引用次数: 0

摘要

华北克拉通东部通过俯冲地壳物质的再循环，经历了多期岩石圈改造。然而，在晚中生代演化过程中，次大陆岩石圈地幔富碳域形成的机制尚不清楚。本文报道了早白垩世方城玄武岩含磷灰石地幔包体的岩石学特征和原位地球化学特征。氟磷灰石与橄榄石、斜辉石质接近平衡，且橄榄石、斜辉石质中斜辉石质比例高，CO2流体包裹体丰富，表明碳酸盐交代作用的发生。磷灰石的地球化学组成显示出较高的F丰度（~ 2.78 wt%）和Sr丰度（~ 3842 ppm），低Sr/Y （<52）和高（La/Yb）N（~ 215）之比，类似于碳酸盐岩浆中磷灰石的结晶。斜辉石中Al、Ti含量低，Ti/Eu比值低（517 ~ 1867），La/Yb、N比值高（13 ~ 15），Ca/Al比值高（7 ~ 9），与碳酸盐岩交代作用的地球化学趋势一致。橄榄石中Li浓度升高（> 3ppm）， V/Sc比值较低（<3），表明地壳成分的再循环对橄榄岩岩石圈有贡献。此外，方城玄武岩中高富集的Sr-Nd同位素支持了方城岩浆岩在融入早白垩世玄武岩岩浆之前被俯冲碳酸化泥岩衍生的碳酸岩岩浆交代的推断。这一交代过程是岩石圈改造的重要机制，在NCC东南部的区域碳循环中起着关键作用，包括含碳酸盐大陆地壳的俯冲和随后通过地幔源火山作用的脱挥发。

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Apatite-bearing mantle xenoliths in Early Cretaceous basalts: Implications for geochemical modifications and carbon cycling in eastern North China Craton

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Apatite-bearing mantle xenoliths in Early Cretaceous basalts: Implications for geochemical modifications and carbon cycling in eastern North China Craton

The eastern North China Craton (NCC) has undergone multistage lithospheric modifications through the recycling of subducted crustal materials. However, the mechanisms underlying the formation of carbon-rich domains in the subcontinental lithospheric mantle during the Late Mesozoic evolution remain poorly understood. Here, we report the petrological and in-situ geochemical characteristics of apatite-bearing mantle xenoliths from the Early Cretaceous Fangcheng basalts. The presence of near-equilibrium fluorapatites with olivines and clinopyroxenes along with a high proportion of clinopyroxenes and abundant CO₂ fluid inclusions in the wehrlites and olivine clinopyroxenites indicates the occurrence of carbonatite metasomatism. The geochemical compositions of the apatites show relatively high abundances of F (∼2.78 wt%) and Sr (∼3842 ppm), low Sr/Y (<52) and high (La/Yb)_N (∼215) ratios, resembling apatite crystallizing from carbonatite magmas. Clinopyroxenes exhibit low Al and Ti concentrations and are characterized by low Ti/Eu ratio (517–1867) and high (La/Yb)_N (13–15) and Ca/Al ratios (7–9), consistent with geochemical trends associated with carbonatite metasomatism. Elevated Li concentration (>3 ppm) and low V/Sc ratio (<3) in olivines suggest the contribution of recycled crustal components to the peridotitic lithosphere. Additionally, highly enriched Sr-Nd isotopes reported in the Fangcheng basalts support the inference that Fangcheng wehrlites were metasomatized by carbonatite magmas derived from subducted carbonated pelites before being incorporated into the Early Cretaceous basaltic magmas. This metasomatic process serves as a crucial mechanism for lithospheric modifications and plays a key role in regional carbon cycling in the southeastern NCC, encompassing the subduction of carbonate-bearing continental crusts and subsequent devolatilization through mantle-derived volcanism.

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来源期刊

Journal of Asian Earth Sciences 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

324

审稿时长

71 days

期刊介绍： Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance. The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.