747 of MgO + Fe 2 O T 3 ranged from 4. 5% to % which indicates that the mudstone contained a relative quantity of potassium-bearing mineral and

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1 GLOBAL GEOLOGY Vol. 33 No. 4 Dec NGN1 w SiO % ~ % w K 2 O w Na 2 O w MgO + Fe 2 O T % ~ % PAAS Eu CIA 48 ~ 62 Th /U ~ 4 Th /Sc -Zr /Sc P P595 A doi /j. issn Geochemical characteristics and geological implications of mud shale from the 1st Member of Qingshankou Formation of southeastern uplifted area in Songliao Basin LI Xiang 1 LIU Zhao-jun 1 2 SUN Ping-chang 1 2 LI Bao-yi 1 2 LIU Rong 1 2 ZHANG Ming-ming 1 ZHEN Zhen 1 YANG Xiao-hong 1 1. College of Earth Sciences Jilin University Changchun China 2. Jilin Province Key Laboratory of Oil Shale and Symbiotic Mineral Jilin University Changchun China Abstract The 1st Member of Qingshankou Formation in Songliao Basin is composed mainly of dark-colored mudstone and developed in good quality oil shales. Based on systematic sampling the geochemical analysis of the mudstone from Well NGN1 in the southeast uplift of Songliao Basin was made by the authors. The results show the SiO 2 content ranged from % to % K 2 O generally higher than Na 2 O in content and the parameter M liuzj@ jlu. edu. cn

2 747 of MgO + Fe 2 O T 3 ranged from 4. 5% to % which indicates that the mudstone contained a relative quantity of potassium-bearing mineral and a certain amount of femic constituents. The PAAS-standardized distributive curves of trace elements show the same enrichment and depletion trends among different samples which suggests that the mudstone had a dominating provenance. The chondrite standard curve of rare earth elements reveals the enrichment in light REE and negative anomalies of Eu which shows the provenance of the mudstone came from the upper crust. The mudstone weathering and alteration index ranged from 48 to 62 and Th /U ratio mainly ranged from to 4 both of which suggest that the provenance had underwent a low weathering processes. The Th /Sc- Zr /Sc diagram shows that these mudstones were mainly controlled by source rocks and their clastic deposits had not suffered sedimentary recycling which means the provenance characteristics and tectonic setting of the mudstones could be judged by the geochemical analysis. On the basis of sourse rocks and discrimination diagrams of tectonic setting it was concluded that the provenances of the 1st Member of Qingshankou Formation were mainly intermediate-acid extrusive rocks from Mid-Late Jurassic and also involved in Hercynian and Yanshanian granities. The source rocks were formed in the continental margin orogenic belt and belonged to continental island arcvolcanic series. Key words Songliao Basin geochemistry mud shale provenance tectonic setting Qingshankou Formation Th Sc Co Zr Hf Ti Nb REE NGN1 1 4 ± 2 m 1 X - XRF < 1% ES X -

3 XRF < 1% ICP -MS < 5% Fig. 1 1 NGN1 Location of Well NGN1 in Songliao Basin and sampling positions w SiO % ~ % % w Al 2 O % ~ % % w K 2 O 1. 8% ~ 3. 75% 3. 28% w Na 2 O 1. 8% ~ 4. 22% 2. 69% w K 2 O w Na 2 O w MgO + Fe 2 O T % ~ % 7. 48% w TiO % ~ 0. 66% 2 NGN1 PAAS 0. 57% Fig. 2 PAAS - normalized spider diagram of mudstone in the 1st Member of Qingshankou Formation PAAS 2 2 from Well NGN1 in Songliao Basin

4 749 Table 1 1 NGN1 Major elements contents of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin /wt % SiO 2 Al 2 O 3 Fe 2 O 3 FeO MgO CaO Na 2 O K 2 O MnO TiO 2 P 2 O 5 LOI Fe 2 O3 T N N N N N N N N N N N N N N N N N ~ Ce / Sr Nb Cr Co Ni Ce* 0. 9 ~ Th Th 3A LREE HREE La / 3. 3 Yb N 6. 7 ~ δeu ~ Eu ΣREE ~ ΣLREE ~ ΣHREE Fig NGN1 A PAAS B 14 Chondrite-normalized A and post-archaean average shale B REE diagrams for mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin

5 Table 2 2 NGN1 Trace and REE elements contents of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin /μg g - 1 N1-1 N1-2 N1-3 N1-4 N1-5 N1-6 N1-7 N1-8 N1-9 N1-10 N1-11 N1-12 N1-13 N1-14 N1-15 N1-16 N1-17 Li Sc V Cr Co Ni Cu Zn Ga Rb Sr Y Nb Mo La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th U Zr Hf La N /Yb N Eu /Eu * Ce /Ce * LREE /HREE ΣREE

6 751 PAAS 3B CaO CaO CaO * McLen- nan 18 CaO* = CaO - 10 /3 P 2 O 5 PAAS CaO Na 2 O A -CN -K 4A w SiO 2 / w Al 2 O ~ Al 3 + Ti Na + Ca 2 + K Th /U 20 Th /U > 4 23 Th /U -Th 4B 16 Nesbit 17 CIA Th /U = 4 Th /U = 4 CIA = ~ Al 2 O 3 / Al 2 O 3 + CaO * + Na 2 O + K 2 O CaO CaO* Na 2 O CaO* CIA 48 ~ 62 A -CN Th /U Th /U 3. 8 CaO * A. Al 2 O 3 - Al 2 O 3 + CaO* - K 2 O 17 B. Th /U - Th 23 Fig. 4 4 NGN1 Provenance of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin Zr /Sc 24 Th Sc 25 Th / Th /Sc Sc -Zr /Sc 20 Th /Sc -Zr /Sc 20 Zr 5 BFG UCC

7 Cr Co Ni Th /Sc Eu Co Fioyd Leveridge 29 La /Th -Hf 6A 20 5 NGN1 Zr/Sc -Th/Sc Fig. 5 Zr /Sc -Th /Sc diagram for mudstone in the 1st Member of Qingshankou Formation from Well Wronkiewics Condie 30 NGN1 in Songliao Basin Co /Th La /Sc Co /Th -La /Sc 6B 4. 2 La Th REE Zr /Sc Allegre Minister 31 La /Yb - REE 6C Cr Co Ni Sc La Th Zr Hf REE 26 A. La /Th -Hf 29 B. Co /Th -La /Sc 30 C. La /Yb - REE 31 Fig. 6 6 NGN1 Discrimination diagrams illustrating sedimentary provenance of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin 4. 3 Bhatia 30-33

8 753 TiO 2 - Roser Korsch 34 log K 2 O + MgO + Fe 2 O T 3 Al 2 O 3 / SiO 2 - MgO + Na 2 O - SiO 2 7C Fe 2 O T 3 7A B 4A B A. TiO 2 - MgO + Fe 2 O3 T 32 B. Al 2 O 3 / SiO 2 - MgO + Fe 2 O3 T 32 C. log K 2 O + Na 2 O - SiO 34 2 a. b. c. d.. Fig. 7 7 NGN1 Tectonic discrimination plots of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin A. Th -Co -Zr /10 B. Th -Sc -Zr /10 C. La -Th -Sc a. b. c. d.. Fig NGN1 Tectonic discrimination plots of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin 8A 8B 8C Bhatia Crook 33 La -Th - Sc Th -Sc -Zr /10 Th -Co -Zr /10 8

754 33 A. NGN1 486. 9 m + B. NGN1 443. 8 m + C. NGN1 463. 35 m + D. NGN1 438. 45 m +. Fig.

9 A. NGN m + B. NGN m + C. NGN m + D. NGN m +. Fig. 9 9 NGN1 Petrological characteristics of mudstone in the 1st Member of Qingshankou Formation from Well NGN1 in Songliao Basin ~ 30 cm /a 9A 9B

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12 Nonna B C. WU Fu-yuan SUN De-you LIN Qiang et al. Petro- - genesis of the Phanerozoic granites and crustal growth in J. Northeast China J Acta Petrologica Sinica XU De-ru MA Chi Nonna B C et al. Petrological 38. mineralogical and geochemical characteristics of Ordovician volcanic-clastic sedimentary rocks in Bangxi area J Northwest Hainan Island South China implication for WANG Xin-wen LIU You-yuan. Premesozoic tectonic provenance and tectonic setting J. Geochemica Floyd P A Leveridge B E. Tectonic environment of the Devonian Gramscatho Basin south Cornwall framework mode and geochemical evidence from turbiditic sandstones J. Journal of the Geological Society Wronkiewicz D J Condie K C. Geochemistry of Archean shales from the Witwatersr and Supergroup South Africa source-area weathering and provenance J. Geochimica et Cosmochimica Acta Allegre C J Minster J F. Quantitative models of trace element behavior in magmatic processes J. Earth and Planetary Science Letters Bhatia M R. Plate tectonics and geochemical composition of sandstones J. The Journal of Geology Bhatia M R Crook K A W. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins J. Contributions to Mineralogy and Petrology Roser B P Korsch R J. Determination of tectonic setting of sandstone-mudstone suites using content and ratio J. The Journal of Geology Bhatia M R. Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks provenance and tectonic control J. Sedimentary Geology McLennan S M. Relationships between the trace element composition of sedimentary rocks and upper continental crust J. Geochemistry Geophysics Geosystems /2000GC J evolution and its relation with development of Late Mesozoic basins in northeastern China J. Geoscience J LIU Yong-jiang ZHANG Xing-zhou JIN Wei et al. Late Paleozoic tectonic evolution in Northeast China J. Geology in China J XU Wen-liang SUN De-you YIN Xiu-ying. Evolution of Hercynian orogenic belt in Daxing'anling Mt evidence from granitic rocks J. Journal of Changchun University of Science and Technology J GAO Yang ZHANG Zhao-chong YANG Tie-zheng. Geology -geochemistry and petrogenesis of Late Hercynian granites in Baoshan area Heilongjiang Province J. Acta Petrologica et Mineralogica J JIANG Kai-jun ZHOU Yong-chang. Magmatic evolution and structural environment of the Dahuanggou granitoid batholith in the Hunchun area Jilin Province J. Geological Review

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GeologicalScienceandTechnologyInformation Vol.37 No.2 Mar doi: /j.cnki.dzkq ,,,. [J].,2018,37(2):71-78.,,,, (, 62100

37 2 2018 3 GeologicalScienceandTechnologyInformation Vol.37 No.2 Mar. 2018 doi:10.19509/j.cnki.dzkq.2018.0210. [J]. 201837(2):71-78. ( 621000) : (CIA) (ICV) - : ; ; ; ; :P534.51 :A :1000-7849(2018)02-0071-08