Petrological and geochemical insights into the genesis and geothermal potential of Late Neoarchean granitoid rocks in the Matouying Uplift, North China Craton

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2025-03-11 DOI:10.1016/j.precamres.2025.107763

Quan Gan , Luming Song , Shuantong Shangguan , Xiaofei Qi , Zhiwei Liao , Jianye Chen , Zhili Yang , Guiling Wang , Guangyao Xin , Chongyuan Zhang

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Abstract

The Matouying geothermal area, located in the eastern region of the North China Craton, is a significant site for hot dry rock (HDR) geothermal exploration. However, the petrogenesis and tectonic setting of the granitoid reservoir remain unclear. This study provides a comprehensive analysis of petrographic, geochemical, Sm-Nd isotopic, zircon Hf isotopic, and U-Pb geochronological data from granitoid samples obtained through deep drilling in the Matouying. The granitoid rocks are classified into three distinct groups based on geochemical characteristics. Group #1 samples exhibit high Sr/Y and (La/Yb)_N ratios, along with ε_Hf(t) values ranging from −0.75 to + 3.34 and ε_Nd(t) from −0.39 to + 1.54, suggesting they were similar to adakitic rocks which originated from partial melting of juvenile subducted oceanic crust. Group #2 samples show weaker LREE/HREE fractionation, LILE enrichment and HFSE depletion (e.g., Nb, Th, Ti), accompanied by negative Eu anomalies. Isotopic data reveal more negative ε_Hf(t) (−8.87 to −4.13) and ε_Nd(t) (−2.34 to + 0.40), indicating formation from partial melting of ancient lower crust under low-pressure conditions. Group #3 samples display variable LREE/HREE fractionation and stronger LILE enrichment, with a smaller degree of depletion in HFSEs compared to Group #1, and show weaker or no Eu anomalies. Isotopic analyses show ε_Hf(t) values from −6.02 to −2.99 and ε_Nd(t) from −14.10 to −4.90, suggesting medium-pressure partial melting of ancient lower crust. Zircon U-Pb dating yields ages of 2495–2502 Ma for Group #1, 2514 Ma for Group #2, and 2534 Ma for Group #3, indicating their formation during the Late Neoarchean (∼2.5 Ga) in a subduction-related arc. The calculated heat generation rates for the Matouying reservoir range from 0.40 to 2.11 μW/m³, with an average arithmetic value of 0.84 μW/m³, indicating a relatively subdued radiogenic heat production potential for geothermal sources. Instead, cumulative evidence suggests that heat derived from the mantle, potentially sourced from deep-seated magma chambers, is the primary contributor. This contribution offers a rational understanding on the HDR reservoir mechanism in Matouying from petrological and geochemical aspects, aiding geothermal potential assessment and estimation.

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华北克拉通马头营隆起晚新太古代花岗岩类岩石成因及地热潜力的岩石地球化学研究

马头营地热区位于华北克拉通东部，是一个重要的热干岩（HDR）地热勘探区。然而，花岗岩类储层的成因和构造背景尚不清楚。本文对马头营花岗岩样品的岩石学、地球化学、Sm-Nd同位素、锆石Hf同位素和U-Pb年代学数据进行了综合分析。根据地球化学特征，将花岗岩类岩石划分为三大类。组1样品具有较高的Sr/Y和（La/Yb）N比值，εHf(t)值在- 0.75 ~ + 3.34之间，εNd(t)值在- 0.39 ~ + 1.54之间，与幼年俯冲洋壳部分熔融形成的阿达质岩相似。组2样品表现出较弱的LREE/HREE分馏，LILE富集和HFSE耗损（如Nb， Th, Ti），并伴有负Eu异常。同位素数据显示εHf(t)为负（- 8.87 ~ - 4.13），εNd(t)为负（- 2.34 ~ + 0.40），表明古下地壳在低压条件下部分熔融形成。组3样品表现出可变的LREE/HREE分馏和较强的LILE富集，与组1相比，hfse的损耗程度较小，且Eu异常较弱或不存在。同位素分析显示，εHf(t)值在- 6.02 ~ - 2.99之间，εNd(t)值在- 14.10 ~ - 4.90之间，表明古下地壳存在中压部分熔融。锆石U-Pb测年结果显示，第1组年龄为2495 ~ 2502 Ma，第2组年龄为2514 Ma，第3组年龄为2534 Ma，表明它们形成于晚新太古代（~ 2.5 Ga）的俯冲弧中。计算得出马头营储层的产热率范围为0.40 ~ 2.11 μW/m3，平均算术值为0.84 μW/m3，表明地热资源的放射性成因产热潜力相对较弱。相反，累积的证据表明，来自地幔的热量，可能来自深部岩浆房，是主要的贡献者。这有助于从岩石学和地球化学角度对马头营HDR储层机理进行理性认识，有助于地热潜力评价和评价。

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.