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首页> 外文期刊>The island arc >Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China
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Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China

机译：新发现南福建省后期白垩纪adakites：对中国东南部的后期中生代构造演变的影响

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摘要

> The Yongchun pluton is a Late Cretaceous adakitic intrusion in South Fujian Province, Southeast China, with associated metal mineralization. An understanding of the Yongchun pluton is helpful in tectono‐magmatic evolutionary processes, and is important in explaining the origin of related porphyry‐type deposits. Zircons from three samples of the pluton were analyzed by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS), yielding U–Pb ages of 99.50?±0.87?Ma, 97.74?±0.59?Ma, and 99.65?±0.92?Ma. These ages are similar to those of the Sifang, Luoboling, and Sukeng plutons, all of which are related to Cu–Pb–Zn–Mo mineralization within the study area. The Yongchun pluton comprises high‐potassium, calc‐alkaline, metaluminous rocks, with average A/CNK values of 0.91, 87 Sr/ 86 Sr ratios of 0.705 51 to 0.706 83, εNd(t) values of ?4.63 to ?5.90, and two‐stage Nd model (T 2DM ) ages of 1.49–1.39?Ga, indicating the magmas were generated by partial melting of Mesoproterozoic continental crust mixed with mantle‐derived magmas. The pluton has geochemical characteristics typical of adakites, such as a high Sr content (average 553?ppm), and low Y (average 15.2?ppm) and Yb (average 1.61?ppm) contents, indicating that the parental magma was formed under high‐pressure conditions. The magmatism was associated with thickening of the lower crust during a change in subduction angle and convergence rate of the paleo‐Pacific Plate at 100?Ma. The compression was limited to South Fujian Province.
机译：

Yongchun Pluton是福建省南方东南部的后期白垩纪筑侵犯，拥有相关的金属矿化。对永春芦苇的理解有助于构造 - 岩岩进化过程，并且对于解释相关斑岩型沉积物的起源是重要的。通过激光烧蚀电感耦合等离子体光谱法（La-ICP-MS）分析来自芦苇的三个样品的锆石，产生U-Pb ages99.50Ω±0.87Ω，97.74？±0.59？ma和99.65？ ±0.92？ma。这些年龄与Sifang，Luoboling和Sukeng钚类似，所有这些都与研究区内的Cu-Pb-Zn-Mo矿化有关。永春砌筑包括高钾，钙碱，金属岩，平均A / CNK值为0.91， 87 SR / 86 SR比率为0.705 51至0.706 83 ，εnd（t）α.4.63到？5.90和两级Nd模型（T 2dm ）年龄为1.49-1.39〜Ga，指示岩浆是由Mesoproterozoic Continental Chulust的部分熔化产生的与地幔衍生的岩浆混合。芦苇具有典型的adakites的地球化学特征，例如高Sr含量（平均553〜ppm），低Y（平均为15.2〜ppm）和Yb（平均1.61μl≤PPM）内容物，表明父母岩浆在高处形成 - 压力条件。岩浆广域在古太平板的俯冲角度和100μmAm的变化过程中与下层的增稠相关联。压缩仅限于福建南部。

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