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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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.