Origin and gold mineralization significance of Late Triassic syn-tectonic dykes in the Qingchengzi area, Liaodong Peninsula

doi:10.13745/j.esf.sf.2022.1.21

Abstract

Abstract:

The Qingchengzi area is an important gold ore concentration area in the Liaodong Peninsula where Mesozoic magmatism played a key role in gold mineralization. The widely developed Late Triassic granitic dykes, which are closely related to gold veins, are emplaced mainly along the NE-/EW-trending faults around 224-217 Ma and subsequently experienced extensional event. These dykes, as revealed by geochemical analysis, have high Sr (362.00×10^-6-1296.85×10^-6) and low Y (4.73×10^-6-12.30×10^-6) and Yb (0.49×10^-6-1.05×10^-6) contents and high Sr/Y ratios (38-118), showing the characteristics of high-Sr, low-Yb granitoid, while the structural discrimination diagram indicates they are likely syn-collisional granites. Sr-Nd isotopic composition shows that these dykes have high (⁸⁷Sr/⁸⁶Sr)_i ratios (0.7078-0.7109) and low ε_Nd(t) values (-16.34--15.30) and T_DM2 ages of 2323-2237 Ma, indicating they are derived from the melting of thickened lower crust. Meanwhile geochemical analysis indicates a neighboring rock mass, Dixiongshan pluton (211 Ma), is formed in a post-collision extensional environment. Thus we suggest that these dykes might be formed during the tectonic transition from compression to extension in the late stage of continent-continent collision between the North and South China Blocks. In the Qingchengzi area, Late Triassic dykes and gold veins are closely related in emplacement time, space and genesis as they commonly develop in parallel in similar tectonic settings, and some dykes are also gold veins. Multi-stage gold mineralization in the Qingchengzi area includes the main mineralization period, resulted by the Late Triassic compressional tectonics, and the re-enrichment period, resulted by the Early Cretaceous tectono-magmatism. Therefore the widely developed Late Triassic dykes in the Qingchengzi area may be an important indicator for gold deposit prospecting.

Key words: Qingchengzi area, Late Triassic dyke, geochemical characteristics, ore control structure, gold mineralization

CLC Number:

DONG Xiaoyu, KONG Ruoyan, YAN Danping, QIU Liang, QIU Junting. Origin and gold mineralization significance of Late Triassic syn-tectonic dykes in the Qingchengzi area, Liaodong Peninsula[J]. Earth Science Frontiers, 2023, 30(2): 215-238.

Figures/Tables 16

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样品编号	岩性	侵位年龄/Ma	测试内容
LD19128-2	花岗斑岩岩脉	218.9±2.8(本文)	锆石U-Pb定年、全岩主微量、Sr-Nd同位素
LD19112-6	花岗岩脉	218.2±0.9(本文)	锆石U-Pb定年、全岩主微量、Sr-Nd同位素
QC054-4	花岗斑岩岩脉	217.8±1.2^[29]	全岩主微量、Sr-Nd同位素
QC054-4-1	花岗斑岩岩脉	217.8±1.2^[29]	全岩主微量
LD19115-1	花岗斑岩岩脉	220.3±0.8^[29]	全岩主微量、Sr-Nd同位素
LD1934-2-1	花岗岩	211±2^[35]	全岩主微量
LD1936-2-1	花岗岩	211±2^[35]	全岩主微量
LD1919-2-1	花岗岩	211±2^[35]	全岩主微量

样品编号	岩性	侵位年龄/Ma	测试内容
LD19128-2	花岗斑岩岩脉	218.9±2.8(本文)	锆石U-Pb定年、全岩主微量、Sr-Nd同位素
LD19112-6	花岗岩脉	218.2±0.9(本文)	锆石U-Pb定年、全岩主微量、Sr-Nd同位素
QC054-4	花岗斑岩岩脉	217.8±1.2^[29]	全岩主微量、Sr-Nd同位素
QC054-4-1	花岗斑岩岩脉	217.8±1.2^[29]	全岩主微量
LD19115-1	花岗斑岩岩脉	220.3±0.8^[29]	全岩主微量、Sr-Nd同位素
LD1934-2-1	花岗岩	211±2^[35]	全岩主微量
LD1936-2-1	花岗岩	211±2^[35]	全岩主微量
LD1919-2-1	花岗岩	211±2^[35]	全岩主微量

样品编号	w_B/10^-6		⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	(⁸⁷Sr/ ⁸⁶Sr)_i	w_B/10^-6		¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd (t)	T_DM/ Ma	T_DM2/ Ma
样品编号	Rb	Sr	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	(⁸⁷Sr/ ⁸⁶Sr)_i	Sm	Nd	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd (t)	T_DM/ Ma	T_DM2/ Ma
LD19128-2	139.8	1035	0.390 773	0.712 09	0.710 8	8.7	64.8	0.081 125	0.511 669	0.511 553	-15.68	1 701	2 269
LD19112-6	246.8	180	3.967 305	0.720 05	0.707 8	1.24	7.44	0.100 858	0.511 704	0.511 56	-15.56	1 950	2 258
QC054-1	234.9	366.2	1.856 078	0.716 687	0.710 9	4.76	37.4	0.076 795	0.511 683	0.511 573	-15.3	1 632	2 237
LD19115-1	64.3	604.7	0.31	0.710 013	0.709 1	2.13	13.02	0.098 845	0.511 66	0.511 518	-16.34	1 974	2 323

样品编号	w_B/10^-6		⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	(⁸⁷Sr/ ⁸⁶Sr)_i	w_B/10^-6		¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd (t)	T_DM/ Ma	T_DM2/ Ma
样品编号	Rb	Sr	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr	(⁸⁷Sr/ ⁸⁶Sr)_i	Sm	Nd	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd (t)	T_DM/ Ma	T_DM2/ Ma
LD19128-2	139.8	1035	0.390 773	0.712 09	0.710 8	8.7	64.8	0.081 125	0.511 669	0.511 553	-15.68	1 701	2 269
LD19112-6	246.8	180	3.967 305	0.720 05	0.707 8	1.24	7.44	0.100 858	0.511 704	0.511 56	-15.56	1 950	2 258
QC054-1	234.9	366.2	1.856 078	0.716 687	0.710 9	4.76	37.4	0.076 795	0.511 683	0.511 573	-15.3	1 632	2 237
LD19115-1	64.3	604.7	0.31	0.710 013	0.709 1	2.13	13.02	0.098 845	0.511 66	0.511 518	-16.34	1 974	2 323