南岭于都—赣县矿集区银坑示范区重磁资料探测花岗岩分布研究

doi:10.11720/wtyht.2019.1352

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Abstract

Located in Yinkeng Town, Yududu-Ganxian ore concentration area, east Nanling Mountains, Southeast China, the Yinkeng Demonstration Area has a good prospect of mineralization, where the granite is closely related to mineralization. Therefore, systematic exploration of granite distribution is one of the key problems in deep prospecting. In this paper, the spatial distribution characteristics of regional granite were comprehensively studied by using gravity and magnetic data, combined with physical, geological, electrical and seismic data. Firstly, the planar distribution of six granite masses in this area was studied and deduced, among which Jiangbei rock mass, Changtan rock mass and Gaoshanjiao rock mass are partially concealed, whereas Liumukeng rock mass and the shallow and deep rock masses of Ge’aowei are completely concealed. It is concluded that the rock mass mainly trends in NE and NNE direction. Then, four gravity (or gravity and magnetic) profiles in the study area were used to invert the spatial distribution of granite, which further revealed the spatial distribution characteristics of the above six rock masses. The inferences are consistent with those obtained by plane gravity and magnetic method as well as the results derived from electrical method and seismic profile interpretation.

Key words： Nanling Yinkeng Demonstration Area gravity and magnetic anomalies granite prospecting

Received: 26 September 2018 Published: 10 April 2019

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	Jin-Lan LIU
	Bin ZHAO
	Wan-Yin WANG
	Jian-Guo LI
	Xin-Peng ZHOU
	Yun-Peng WANG

Cite this article:

Jin-Lan LIU,Bin ZHAO,Wan-Yin WANG, et al. A study of the distribution of granite detected by gravity and magnetic data in Yinkeng Demonstration Area of Nanling Yudu-Ganxian ore concentration area[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 223-233.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1352 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/223

15]
1—Yangtze base uplift; 2—Ccathaysoid base uplift; 3—fault zone and mark; 4—tectonic unit boundary; 5—Yudu-Ganxian ore concentration zone; 6—Yinkeng Demonstration Area; 7—Yangtze Block; 8—South China active belt
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Schematic map of the geotectonics in the Yinkeng Demonstration Area of the Yudu-Ganxian ore concentration zone in the Nanling area^[15]
1—Yangtze base uplift; 2—Ccathaysoid base uplift; 3—fault zone and mark; 4—tectonic unit boundary; 5—Yudu-Ganxian ore concentration zone; 6—Yinkeng Demonstration Area; 7—Yangtze Block; 8—South China active belt

Overall distribution of the exposed rock mass in the Yinkeng Demonstration Area
1—fine-grained porphyritic biotite granodiorite;2—fine-grained monzogranite;3—meso-fine-grained porphyritic biotite monzogranite;4—meso-coarse-grained porphyritic biotite monzogranite;5—meso-grained porphyritic biotite monzogranite;6—meso-grained oligophyric biotite monzogranite;7—granite prophyry;8—fine-grained muscovite monzogranite;9—fine-grained oligophyric tourmalinite monzogranite;10—meso-coarse-grained porphyritic biotite monzogranite;11—muscovitization meso-grained porphyritic monzogranite;12—meso-coarse-grained porphyritic biotite monzogranite;13—diorite porphyrite;14—dikes (granite porphyry, granodiorite porphyry, and quartz porphyry);15—Yinkeng ore field

Fig.2); d—inferred planar distribution of the granite using high-precision ground magnetic survey data(blue indicates the inferred Gaoshanjiao granite; green indicates the inferred Liumukeng granite)
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Characteristics of the high-precision magnetic anomaly reduction to the pole (RTP) and the deduction of granite distribution in the Yinkeng ore field
a—RTP magnetic anomaly map of the high-precision; b—vertical first-order derivative diagram of the magnetic anomaly of the high-precision RTP magnetic anomaly (thick black line: zero-value line of the vertical first-order derivative, same as below); c—vertical first-order derivative diagram of the magnetic anomaly of the high-precision RTP magnetic anomaly (distributions of the exposed magmatic rock attached; legend is the same as in Fig.2); d—inferred planar distribution of the granite using high-precision ground magnetic survey data(blue indicates the inferred Gaoshanjiao granite; green indicates the inferred Liumukeng granite)

Fig. 2); b—vertical first-order derivative graph of the Bouguer gravity anomaly (thick black line is the zero-value line of the vertical first-order derivative, the same as below); c—aeromagnetic RTP magnetic anomaly chart; d—vertical first-order derivative chart of the aeromagnetic RTP magnetic anomaly
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Relationship between the gravity and magnetic anomalies and the granite distributions in the Yinkeng Demonstration Area
a—bouguer gravity anomaly map (distribution of the exposed granite is attached, and the legend is the same as in Fig. 2); b—vertical first-order derivative graph of the Bouguer gravity anomaly (thick black line is the zero-value line of the vertical first-order derivative, the same as below); c—aeromagnetic RTP magnetic anomaly chart; d—vertical first-order derivative chart of the aeromagnetic RTP magnetic anomaly

Comprehensively inferred planar position distributions of the granite using the gravity and magnetic data of the Yinkeng Demonstration Area
1—Jiangbei rock mass; 2—Changtan rock mass; 3—Gaoshanjiao rock mass; 4—Ge'aowei shallow rock mass; 5—Ge'aowei deep rock mass; 6—Liumukeng rock mass; 7—other rock masses; 8—ore field; 9—profile position

Residual Bouguer gravity anomaly map of the Yinkeng Demonstration Area
(red line denotes the profile positions; blue line is the Yinkeng ore field)

14]; c—2D reflection seismic stack profile results^[25]
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Granite distribution results obtained by the gravity, electrical and seismic inversion methods applied to Line 145 of the Yinkeng Demonstration Area
a—residual Bouguer anomaly inversion results; b—AMT resistivity profile^[14]; c—2D reflection seismic stack profile results^[25]

Three-dimensional layout of the granite profile locations of the four profiles in the Yinkeng Demonstration Area obtained by gravity (magnetic) inversion
1—Jiangbei rock mass; 2—Changtan rock mass; 3—Liumukeng rock mass; 4—Gaoshanjiao rock mass; 5—Ge'aowei rock mass;6—Sedimentary strata; 7—Qingbaikou-Sinian strata

岩体标号	岩体名称	反演利用的重(磁) 剖面资料	反演剖面线号	重磁场特征	隐伏或出露情况	岩体断面空间分布特征
A	江背花岗岩体	1∶20万剩余布格重力异常	145线	低重, 高—弱磁性	少部分出露,绝大部分隐伏	地表出露部分岩体薄,厚度不超过0.4 km,隐伏部分位于出露岩体的东南边,自西北向东南方向向下延伸,下底埋深达16.59 km,水平宽度为2.2~2.81 km
B	长潭花岗岩体	1∶20万剩余布格重力异常	145线 115线	低重弱磁	少部分出露,大部分隐伏	整体形状为椭圆形,向西南方向岩体厚度渐薄; 145线:下底面埋深约1.89 km,水平宽度约3.51 km; 115线:下底面埋深为0.25~0.43 km,水平宽度约3.5 km
C	高山角花岗岩体	1∶1万地面磁测,剩余布格重力异常	L2线 170线	低重高磁	出露面积小,绝大部分隐伏	呈柱状向地层深部延伸; L2线:隐伏岩体上顶面埋深约0.33 km,下底面埋深约3.84 km,水平宽度0.578~1.92 km; 170线:隐伏岩体上顶面埋深为0.15~1.23 km,下底面埋深4.39 km,水平宽度为1.78~2.87 km
D	葛凹圩浅部花岗岩体	1∶20万剩余布格重力异常	L2线	低重高磁	完全隐伏	形状如椭圆形,上顶面埋深约0.52 km,下底面埋深达1.7 km,水平宽度约3.1 km
E	葛凹圩深部花岗岩体	1∶20万剩余布格重力异常	L2线 170线	低重弱磁	完全隐伏	形状如长条水平板状; L2线:埋深和规模皆大,上顶面埋深为1.99~2.37 km,下底面约3.76 km,水平宽度达10.37 km; 170线:上顶面埋深约为2.35 km,下底面约4.38 km,水平宽度达2.83 km
F	柳木坑花岗岩体	1∶1万地面磁测,1∶20万剩余布格重力异常	145线 115线	相对低重,中— 弱磁性	完全隐伏	岩体浅部为起伏岩体,故高精度地磁资料识别的是浅部岩凸位置; 岩体深部呈柱状向地层内部延伸; 上顶面埋深2.63~5.34 km,下底面埋深约17.18 km,水平宽度为2.2~3.8 km,整体规模较大。

Spatial distribution characteristics of the granite in the Yinkeng Demonstration Area inverted by the gravity (magnetic) anomaly profiles

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