Comparision of Heavy Mineral Provenance Analysis Methods Based on SEM

doi:10.19657/j.geoscience.1000-8527.2022.032

Abstract

Abstract:

Heavy minerals inherit the characteristics of source rocks and can reveal the source-sink connection between the sedimentary basin and the source area. With the development of scanning electron microscope and automatic mineral identification technology, the identification of heavy minerals has gradually changed from manual microscope identification to automatic quantitative analysis. In this paper, on the basis of traditional microscope identification, scanning electron microscopy-energy dispersive spectrometer/backscatter electron (SEM-EDS/BSE) and Tescan Integrated Mineral Analyzer (TIMA) are used to identify and count heavy minerals. We also compared and summarized the characteristics and applicability of different analysis methods. Besides, the Mesozoic provenance area in the northwestern margin of Junggar Basin is preliminarily discussed. The results show that both analysis methods based on SEM can determine and count various heavy minerals well: SEM-EDS/BSE can be more flexible in the statistics of altered minerals; TIMA can quickly and accurately obtain a variety of minerals information, but caution should be exercised in the statistics of altered minerals. According to the heavy mineral assemblage, ZTR index, and previous U-Pb age and paleocurrent data, it is believed that the Mesozoic provenance in the northwestern margin of Junggar Basin mainly came from the Zaire Mountain, and the Halaalat Mountain uplifted and began to provide provenance for Karamay and Bailishan areas during the Late Triassic to Early Jurassic.

Key words: heavy mineral statistics, SEM, EDS, BSE, TIMA, provenance analysis

CLC Number:

TE121.3
P571

CAO Yulu, ZENG Yuke, ZHANG Yuanyuan. Comparision of Heavy Mineral Provenance Analysis Methods Based on SEM[J]. Geoscience, 2023, 37(02): 475-485.

Figures/Tables 8

References 47

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样品号	分析方法	钛铁矿	石榴石	铬铁矿	磁铁矿/赤铁矿	榍石	锆石	金红石	白钛石	磷灰石	角闪石
	能谱法	28.5	23.3	17.0	13.1	9.0	2.8	2.4	2.0	1.9	-
XZ17-19	TIMA点阵模式	16.3	29.3	18.0	7.6	8.8	4.4	-	13.3	1.4	1.0
	TIMA点模式	21.7	29.7	17.1	12.6	13.7	2.0	0.9	-	1.3	-
	能谱法	56.3	21.9	1.8	6.8	4.3	3.9	3.6	-	1.4	-
XZ17-10	TIMA点阵模式	48.7	28.0	2.4	4.3	6.0	7.9	1.6	-	1.1	-
	TIMA点模式	51.2	27.0	2.3	5.1	5.0	2.7	5.6	-	1.2	-

样品号	分析方法	钛铁矿	石榴石	铬铁矿	磁铁矿/赤铁矿	榍石	锆石	金红石	白钛石	磷灰石	角闪石
	能谱法	28.5	23.3	17.0	13.1	9.0	2.8	2.4	2.0	1.9	-
XZ17-19	TIMA点阵模式	16.3	29.3	18.0	7.6	8.8	4.4	-	13.3	1.4	1.0
	TIMA点模式	21.7	29.7	17.1	12.6	13.7	2.0	0.9	-	1.3	-
	能谱法	56.3	21.9	1.8	6.8	4.3	3.9	3.6	-	1.4	-
XZ17-10	TIMA点阵模式	48.7	28.0	2.4	4.3	6.0	7.9	1.6	-	1.1	-
	TIMA点模式	51.2	27.0	2.3	5.1	5.0	2.7	5.6	-	1.2	-

样品号	位置	层位	钛铁矿	锆石	磁铁矿/ 赤铁矿	石榴石
XZ17-106	铁厂沟	T₃b	-	0.7	74.3	-	6.4	-	-	-	-	-	18.7	-	-	-	100.0
XZ17-103	铁厂沟	J₁b	26.6	2.7	2.0	1.1	1.5	65.3	-	-	-	-	-	0.8	-	-	79.6
XZ17-104	铁厂沟	J₁s	-	-	70.7	-	-	-	-	-	-	-	2.3	-	26.0	-	100.0
XZ17-94	白砾山	T₃b	-	-	97.2	-	-	-	-	-	-	-	2.8	-	-	-	100.0
XZ17-96	白砾山	J₁b	2.3	51.6	-	36.6	5.7	-	-	2.8	-	-	-	1.0	-	-	59.2
XZ17-86	白砾山	J₂x	65.0	6.3	3.1	6.5	4.6	-	6.8	-	-	3.5	4.1	-	-	-	47.0
XZ17-03	克拉玛依	T₃x	93.1	4.8	2.1	-	-	-	-	-	-	-	-	-	-	-	100.0
XZ17-06	克拉玛依	J₁b	20.0	3.2	17.5	19.8	18.6	2.6	-	-	-	-	-	-	-	21.0	52.3
XZ17-09	克拉玛依	J₁s	-	-	47.1	29.4	-	-	-	-	-	-	-	-	-	23.5	0
XZ17-10	克拉玛依	J₁s	51.2	2.7	5.1	27	5.6	2.3	-	1.2	5	-	-	-	-	-	20.0

样品号	位置	层位	钛铁矿	锆石	磁铁矿/ 赤铁矿	石榴石
XZ17-106	铁厂沟	T₃b	-	0.7	74.3	-	6.4	-	-	-	-	-	18.7	-	-	-	100.0
XZ17-103	铁厂沟	J₁b	26.6	2.7	2.0	1.1	1.5	65.3	-	-	-	-	-	0.8	-	-	79.6
XZ17-104	铁厂沟	J₁s	-	-	70.7	-	-	-	-	-	-	-	2.3	-	26.0	-	100.0
XZ17-94	白砾山	T₃b	-	-	97.2	-	-	-	-	-	-	-	2.8	-	-	-	100.0
XZ17-96	白砾山	J₁b	2.3	51.6	-	36.6	5.7	-	-	2.8	-	-	-	1.0	-	-	59.2
XZ17-86	白砾山	J₂x	65.0	6.3	3.1	6.5	4.6	-	6.8	-	-	3.5	4.1	-	-	-	47.0
XZ17-03	克拉玛依	T₃x	93.1	4.8	2.1	-	-	-	-	-	-	-	-	-	-	-	100.0
XZ17-06	克拉玛依	J₁b	20.0	3.2	17.5	19.8	18.6	2.6	-	-	-	-	-	-	-	21.0	52.3
XZ17-09	克拉玛依	J₁s	-	-	47.1	29.4	-	-	-	-	-	-	-	-	-	23.5	0
XZ17-10	克拉玛依	J₁s	51.2	2.7	5.1	27	5.6	2.3	-	1.2	5	-	-	-	-	-	20.0