福建宁化禾口红层盆地沙县组的年代学及源区特征
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摘要
宁化禾口盆地位于闽赣交界处,是福建省内较大的红层盆地之一,区内广泛出露的沙县组为一套河流-湖泊相的碎屑岩系。应用LA-ICP-MS技术对沙县组碎屑岩(钙质粉砂岩)和侵入岩(闪长玢岩)进行了U-Pb同位素测年,得出沉积时限94.4～82.2 Ma,时代为晚白垩世。其中沙县组钙质粉砂岩碎屑锆石年龄在(94.4±1)Ma～(2488±21)Ma,分布范围较广,表明物源区特征复杂,包含燕山、印支、加里东、晋宁和吕梁期的产物。
The Hekou basin is located at the junction of Fujian and Jiangxi and is one of the largest red beds basins in Fujian province. The Shaxian Formation is widely composed of a red clasolite series of fluvial-lacustrine facies.Based on the LA-ICP-MS U-Pb dating results of the clastic rock(calcium siltstone) and the intrusive rock(diorite-porphyrite), the deposition age was between 94.4～82.2 Ma,indicated the Shaxian Formation probably at late Cretaceous. The age distribution of the representativv rock-calcareous siltstone of Shaxian Formationis widely between(94.4±1)Ma～(2488±21)Ma,indicating that the source area is complex and contains products from Yenshanian, Indosinian,Caledonian, Jinning and Luliang.
The Hekou basin is located at the junction of Fujian and Jiangxi and is one of the largest red beds basins in Fujian province. The Shaxian Formation is widely composed of a red clasolite series of fluvial-lacustrine facies.Based on the LA-ICP-MS U-Pb dating results of the clastic rock(calcium siltstone) and the intrusive rock(diorite-porphyrite), the deposition age was between 94.4～82.2 Ma,indicated the Shaxian Formation probably at late Cretaceous. The age distribution of the representativv rock-calcareous siltstone of Shaxian Formationis widely between(94.4±1)Ma～(2488±21)Ma,indicating that the source area is complex and contains products from Yenshanian, Indosinian,Caledonian, Jinning and Luliang.
引文
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4 沙金庚.福建宁化禾口盆地早白垩世禾口组的褶珠蚌化石——兼论Plicatounionidae的分类.古生物学报,1990,29(4).
5 沙金庚.福建宁化禾口盆地早白垩世禾口组的类三角蚌——兼论Trigonioididae的分类.古生物学报,1993,32(3).
6 Wan Y S, Li R W, Wilde S A, et al. UHP metamorphism and exhumation of the DabieOrogen: evidence from SHRIMP dating of zircon and monazite from a UHP granitic gneiss cobble from the Hefei Basin, China. Geochimica et CosmochimicaActa, 2005,69.
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21 李学燮,张开毕,揭育金,等.闽西北将乐地区大源片麻岩的地质特征.中国区域地质,2001,20(1).
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23 李献华,王一先,赵振华,等. 闽浙古元古代斜长角闪岩的离子探针锆石U-Pb年代学.地球化学,1998,27(4).
24 WanYusheng, Liu Dunyi, Xu Meihui, et al. SHRIMP U-Pb zircon geochronogy and geochemistry of metavolcanic and metasedimentary rocks in Northwestern Fujian,Cathaysiablock,China:Tectonic implications and the need to redefine lithostratigraphic units. Gondwana Research, 2007,12(1-2).
(1)福建省地质土壤调查所,福建清流、宁化、连城、长汀等县第二号,1941。
(2)南京大学地质系,福建清宁一带1∶20万地质简测报告书,1960。
(3)福建省区域地质调查队,宁化幅1∶20万区域地质调查报告,1972。
(4)福建省区域地质调查队,福建省白垩纪红层、火山盆地地层时序、对比及含矿性研究,1991。
(5)闽西地质大队,1∶5万宁化县幅、石城县幅、中沙幅、小松幅区域地质调查报告,1991。
2 曹美珍.福建禾口盆地早白垩世禾口组的介形类.古生物学报,1986,25(3).
3 曹宝森.关于禾口组的时代问题.科学通报,1987,6.
4 沙金庚.福建宁化禾口盆地早白垩世禾口组的褶珠蚌化石——兼论Plicatounionidae的分类.古生物学报,1990,29(4).
5 沙金庚.福建宁化禾口盆地早白垩世禾口组的类三角蚌——兼论Trigonioididae的分类.古生物学报,1993,32(3).
6 Wan Y S, Li R W, Wilde S A, et al. UHP metamorphism and exhumation of the DabieOrogen: evidence from SHRIMP dating of zircon and monazite from a UHP granitic gneiss cobble from the Hefei Basin, China. Geochimica et CosmochimicaActa, 2005,69.
7 Tang J, Zheng Y F, Wu Y B, et al. Zircon SHRIMP U-Pb dating, C and O isotopes for impure marbles in the Jiaobei Terrane of the Sulu orogen: implication for its tectonic affinity. Precambrian Research, 2006,144.
8 Wan Y S, Song T R, Liu D Y, et al. Mesozoic monazite in Neoproterozoic metasediments: Evidence for low-grade metamorphism of Sinian sediments during Triassic continental collision, Liaodong Peninsula, NE China. Geochemical Journal, 2007,41.
9 Zhou J B, Wilde S A, Zhao G C, et al. Detrital zircon U-Pb dating of low-grade metamorphic rocks in the Sulu UHP belt: evidence for overthrusting of the North China block above the South China block during continental subduction. Journal of the Geological Society, London, 2008,165.
10 Liu, X., Gao, S., Diwu, C., Yuan, H., and Hu, Z. Simultaneous in-situ determination of U-Pb age and trace elements in zircon by LA-ICP-MS in 20 um spot size: Chinese Science Bulletin, 2007, v.52, p.
11 Diwu, C., Sun, Y., Guo, A., Wang, H., Liu, X. Crustal growth in the North China Craton at ～2.5Ga: Evidence from in situ zircon U-Pb ages, Hf isotopes and whole-rock geochemistry of the Dengfeng complex. GondwanaResearch ,2011, 20.
12 Ludwig K R. Users manual for ISOPLOT 3.00: A Geochronological Toolkit for Microsoft Excel. Berkeley: Berkeley Geochronology Center Special Publication, 2003.
13 安伟,旷红伟,柳永清,等.山东诸城晚白垩世王氏群恐龙化石层碎屑锆石定年和物源示踪.地质论评,2016, 62(2).
14 CORFU F, HANCHAR J M, HOSKIN P W, et al. Atlas of zircon textures. Reviews in Mineralogy and Geochemistry, 2003,53(1).
15 吴元保,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,2004,49(16).
16 福建省石油地质队地层古生物组.福建西部白垩纪“红层”的划分,华南中、新生代红层.北京:科学出版社,1979.
17 福建省地质矿产局. 福建省区域地质志.北京:地质出版社,1985.
18 福建省地质矿产局.全国地层多重划分对比研究.福建省岩石地层.武汉:中国地质大学出版社,1997.
19 福建省地质调查研究院.中国区域地质志·福建志.北京:地质出版社,2016.
20 福建省区域地质调查队.福建省1∶500000地质图说明书.福州:福建省地图出版社,1998.
21 李学燮,张开毕,揭育金,等.闽西北将乐地区大源片麻岩的地质特征.中国区域地质,2001,20(1).
22 陈觉民,徐维光.福建建宁中元古代上坪超单元的建立及其特征.福建地质,1992,11(4).
23 李献华,王一先,赵振华,等. 闽浙古元古代斜长角闪岩的离子探针锆石U-Pb年代学.地球化学,1998,27(4).
24 WanYusheng, Liu Dunyi, Xu Meihui, et al. SHRIMP U-Pb zircon geochronogy and geochemistry of metavolcanic and metasedimentary rocks in Northwestern Fujian,Cathaysiablock,China:Tectonic implications and the need to redefine lithostratigraphic units. Gondwana Research, 2007,12(1-2).
(1)福建省地质土壤调查所,福建清流、宁化、连城、长汀等县第二号,1941。
(2)南京大学地质系,福建清宁一带1∶20万地质简测报告书,1960。
(3)福建省区域地质调查队,宁化幅1∶20万区域地质调查报告,1972。
(4)福建省区域地质调查队,福建省白垩纪红层、火山盆地地层时序、对比及含矿性研究,1991。
(5)闽西地质大队,1∶5万宁化县幅、石城县幅、中沙幅、小松幅区域地质调查报告,1991。