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Characteristics of the Density and Magnetic Susceptibility of Rocks in Northern Borneo and their Constraints on the Lithologic Identification of the Mesozoic Rocks in the Southern South China Sea
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14633
Huafeng TANG 1, 2, 3 , Zhigang ZHAO 4 , Zhiwen TIAN 3 , Baoliang LU 5 , Wu TANG 4 , Kailun HE 3 , Chenxi ZHU 3 , Pujun WANG 1, 2, 3
Affiliation  

Based on the volume magnetic susceptibility and specific gravity measurements and mineral and lithologic identification results for 540 samples, the rock type, density, and magnetic susceptibility of rocks from northern Borneo were analyzed, and the applicability of gravity and magnetic data to the lithologic identification of the Mesozoic strata in the southern South China Sea was assessed accordingly. The results show that there are 3 types and 25 subtypes of rocks in northern Borneo, mainly intermediate‐mafic igneous rocks and exogenous clastic sedimentary rocks, with small amounts of endogenous sedimentary rocks, felsic igneous rocks, and metamorphic rocks. The rocks that are very strongly–strongly magnetic and have high–medium densities are mostly igneous rocks, tuffaceous sandstones, and their metamorphic equivalents. The rocks that are weakly magnetic‐non‐magnetic and have medium–very low densities are mostly conglomerates, sandstones, siltstones, mudstones, and coal. The rocks that are weakly magnetic‐diamagnetic and have high‐medium densities are mostly limestones and siliceous rocks. The Cenozoic rocks are characterized by low densities and medium susceptibilities; the Mesozoic rocks are characterized by medium densities and medium–high susceptibilities; and the pre‐Mesozoic rocks are characterized by high densities and low magnetism. Based on these results and the distribution characteristics of the various rock types, it was found that the pre‐Mesozoic rocks produce weak regional gravity anomalies; the Mesozoic sedimentary rocks produce negative regional gravity anomalies; whereas the Mesozoic igneous rocks produce positive regional gravity anomalies; and the Cenozoic igneous rocks produce positive regional gravity anomalies. The regional high magnetic anomalies in the southern part of the South China Sea originate from the Mesozoic mafic igneous rocks and their metamorphic equivalents; and the regional medium magnetic anomalies may be produced by the felsic igneous rocks and their metamorphic equivalents. Accordingly, the identification of the Mesozoic lithology in the southern South China Sea shows that the Mesozoic sedimentary rocks are distributed over a large area of the southern South China Sea. Thus, it is concluded that the Mesozoic strata in this area have the potential for oil and gas exploration.

中文翻译:

婆罗洲北部岩石的密度和磁化率特征及其对南海中生代岩石岩性识别的制约

根据540个样品的体积磁化率和比重测量结果及矿物和岩性识别结果,分析了婆罗洲北部岩石的岩石类型,密度和磁化率,并将重力和磁学数据用于岩石识别。据此对南海南部中生代地层进行了评估。结果表明,婆罗洲北部有3种岩石和25种亚型,主要为中基性火成岩和外生碎屑沉积岩,少量的内生沉积岩,长英质火成岩和变质岩。强烈磁性(强磁性)和中等密度的岩石主要是火成岩,凝灰质砂岩及其变质等价物。弱磁性,非磁性,中低密度的岩石主要是砾岩,砂岩,粉砂岩,泥岩和煤。磁抗磁性弱,中密度高的岩石主要是石灰岩和硅质岩。新生代岩石的特点是密度低,磁化率中等。中生代岩石的特征是中等密度和中等至高磁化率。前中生代岩石具有高密度和低磁性的特征。根据这些结果和各种岩石的分布特征,发现前中生代岩石产生弱的区域重力异常。中生代沉积岩产生负的区域重力异常。中生代火成岩产生正的区域重力异常。新生代火成岩产生正的区域重力异常。南海南部的区域性强磁异常起源于中生代镁铁质火成岩及其变质等价物。长英质火成岩及其变质等价物可能引起区域中等磁异常。因此,对南海南部中生代岩性的识别表明,中生代沉积岩分布在南海南部的大部分地区。因此,可以得出结论,该地区的中生代地层具有油气勘探的潜力。南海南部的区域性强磁异常起源于中生代镁铁质火成岩及其变质等价物。长英质火成岩及其变质等价物可能引起区域中等磁异常。因此,对南海南部中生代岩性的识别表明,中生代沉积岩分布在南海南部的大部分地区。因此,可以得出结论,该地区的中生代地层具有油气勘探的潜力。南海南部的区域性强磁异常起源于中生代镁铁质火成岩及其变质等价物。长英质火成岩及其变质等价物可能引起区域中等磁异常。因此,对南海南部中生代岩性的识别表明,中生代沉积岩分布在南海南部的大部分地区。因此,可以得出结论,该地区的中生代地层具有油气勘探的潜力。对南海南部中生代岩性的识别表明,中生代沉积岩分布在南海南部的一个大区域。因此,可以得出结论,该地区的中生代地层具有油气勘探的潜力。对南海南部中生代岩性的识别表明,中生代沉积岩分布在南海南部的一个大区域。因此,可以得出结论,该地区的中生代地层具有油气勘探的潜力。
更新日期:2021-02-22
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