摘要
论文通过对吉林省东南部晚中生代火山岩进行详细而系统的Ar-Ar年代学、岩石学、主-微量元素和Sr-Nd-Pb同位素地球化学特征的研究,探讨了不同火山岩组的岩石成因和可能的深部过程,论文主要取得以下研究成果和认识:
1 吉林省东南部中生代火山作用的喷发时期为早白垩世,与华北板块内部及邻区的晚中生代火山作用的主体时期一致(126-106 Ma)。
2 根据新的年代学资料,结合已有区域其它资料,重建了延吉地区中生代火山-沉积地层格架如下:三仙岭组/屯田营组(118-115 Ma)、马鹿沟组/天桥岭组(K_1)、金沟岭组(108-106 Ma)、长财组(K_2)、泉水村组(~55 Ma)、大拉子组。
3 通化地区早白垩世两组(果松组和三棵榆树组)中酸性火山岩具有岛弧型的微量元素特征,如轻稀土(LREE)、大离子亲石元素(LILE)富集而高场强元素(HFSE)亏损,并具有中等程度的放射成因Sr和低放射成因Nd-Pb同位素组成。相对于三棵榆树组火山岩,果松组火山岩具有更高的K_2O、A/CNK、HFSE含量(如果松组:Nb=36.2~44.4;三棵榆树组:Nb=12.2~22.1)和Sr-Nd-Pb同位素组成(果松组:~(87)Sr/~(86)Sr(i)=0.70584~0.70656;ε_(Nd)(t)=-11.9~-8.2;~(206)Pb/~(204)Pb(i)=16.41~16.97;三棵榆树组:~(87)Sr/~(86)Sr(i)=0.70539~0.70564,ε_(Nd)(t)=-22.1~-18.0 and ~(206)Pb/~(204)Pb(i)=15.59~16.32)。通化地区晚中生代火山岩的元素-同位素特征暗示这些火山岩为地幔源岩浆与不同类型的华北陆块下地壳混合熔融的产物。其中果松组火山岩为在含水条件下熔融形成的富Nb岩浆分异的产物,其熔融残留相中富Nb矿物很少;而三棵榆树组火山岩的熔融环境则是一种相对干(外来水很少)的体系,在其熔融残留相中有富Nb矿物的存在,形成的岩浆具低Nb特征。华北陆块东部晚中生代下地壳广泛重熔作用与当时岩石圈强烈减薄作用具有非常好的时空耦合关系。
4 辽源-延吉地区晚中生代中基性火山岩具有LREE和LILE富集而HFSE亏损的特征,并具有中等程度的放射成因Sr,类似于全硅质地球的Nd和放射成因的Pb同位素组成(辽源地区晚中生代基性火山岩:~(87)Sr/~(86)Sr(i)=0.70490~0.70550,
Ar-Ar dating results, petrography, major and trace element and Sr-Nd-Pb isotopic data of the late Mesozoic volcanic rocks in the southeastern Jilin Province are presented in this paper with aims to understand the origin of the extensive volcanism and the possible geological implications. Major conclusions are summarized below.
1 The Mesozoic volcanic rocks in the southeastern Jilin Province mainly erupted in early Cretaceous (106-125Ma), temporarily consistent with the late Mesozoic extensive magmatism in eastern China. There did no exist so-called "late Triassic" and "early Jurassic" volcanic rocks in previous work, and the adakitic rocks from the Quanshuicun Formation (Fm.) erupted in Palaeocene (55-58 Ma).
2 On the basis of new Ar-Ar ages, the Mesozoic-early Cenozoic volcano-sedimentary sequence in the Yanji area is rebuilt as: Sanxianling Fm./Tuntianying Fm. (118-115 Ma), Malugou Fm./Tianqiaoling Fm. (K_1), Jingouling Fm. (108-106 Ma), Changcai Fm. (K_2), Quanshuicun Fm. (~55 Ma), and Dalazi Fm.
3 Both groups (Guosong Fm. and Sankeyushu Fm.) of intermediate-felsic
volcanic rocks from the Tonghua area exhibit high-K calc-alkaline to shoshonitic
affinities, characterized by light rare earth element (LREE) and large ion lithophile
element (LILE) enrichment and variable high field strength element (HFSE, e.g., Nb,
Ta and Ti) depletion, and moderately radiogenic Sr and unradiogenic Nd and Pb
isotopic compositions. Compared with the younger group (Sankeyushu Fm.), the
earlier group (Guosong Fm.) of rocks have relatively higher K_2O, A/CNK, HFSE
concentrations (e.g., Nb = 36.2-44.4 ppm in Group 1 compare with Nb = 12.2- 22.1
ppm in Group 2), and Sr-Nd-Pb isotope ratios (~(87)Sr/~(86)Sr(i) = 0.70584 ~ 0.70656, ε_(Nd) (t)
= -11.9 ~ -8.2,~(206)Pb/~(204)Pb(i) = 16.41 ~ 16.97 in Guosong Fm.; ~(87)Sr/~(86)Sr(i) = 0.70539
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