Chronological, Geochemical Characteristics and Geological Significance of Volcanic Rocks in the Late Early Cretaceous in Southeast Guangxi
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摘要: 桂东南地区晚中生代岩浆活动广泛发育，其形成构造背景以及动力学机制仍存在争议.本文对桂东南新州塘、大业地区火山岩进行了年代学、全岩地球化学和Sr-Nd-Hf同位素研究.结果显示新州塘、大业火山岩主体分别为安山岩和英安岩，锆石U-Pb年龄分别为98.5~100.5 Ma、99.2 Ma，均形成于早白垩世晚期. 两者均具有低TiO2（平均值< 1%）、高Al2O3（平均值> 15%）的特点，属于高钾钙碱性-钾玄系列，均富集LILE、亏损HFSE，在稀土元素配分模式上均表现为轻稀土富集右倾型，无明显的Eu异常. 新州塘样品与大业样品相比具有较低的SiO2含量、更高的Mg#值以及更高的Cr、Ni的含量，属于高镁安山岩. Sr-Nd-Hf同位素结果显示新州塘安山岩样品相对大业英安岩样品具有更加亏损的特征εNd（t）值（分别为-6.26~-7.11、-9.35~-9.37）和εHf（t）值（分别为-6.47~-8.95、-8.70~-14.08）.综上所述，桂东南地区新州塘高镁安山岩应该是由富集地幔部分熔融形成，而大业英安岩是同期古元古代地壳物质部分熔融所形成，它们的形成与晚中生代华南大陆的拉张伸展构造密切相关.Abstract: The late Mesozoic magmatism was widely developed in southeastern Guangxi, and its formation background and dynamic mechanism are still controversial. Chronological, whole-rock geochemistry and Sr-Nd-Hf isotope studies were carried out on the volcanic rocks in Xinzhoutang and Daye areas in southeast Guangxi. The results show that the main bodies of the Xinzhoutang and Daye volcanic rocks are andesite and dacite, respectively, and the zircon U-Pb ages are 98.5 to 100.5 Ma and 99.2 Ma, respectively, which were formed in the late Early Cretaceous. Both have the characteristics of low TiO2 (average value < 1%) and high Al2O3 (average value > 15%). They belong to the high potassium calcium-alkaline-potassium series. Both are enriched in LILE and depleted in HFSE, in the rare earth element distribution mode The above all showed the light rare earth enrichment right-leaning type, without obvious Eu anomaly. Compared with the Daye sample, the Xinzhoutang sample has a lower SiO2 content, a higher Mg# value, and a higher Cr and Ni content, It belongs to high magnesium andesite. The Sr-Nd-Hf isotope results show that the Xinzhou Tang andesite samples are more depleted than the Daye dacite samples (εNd(t) values are (-6.26~-7.11, -9.35~-9.37), εHf(t) values are (-6.47~-8.95, -8.70~-14.08)). Comprehensive regional data The Xinzhoutang andesite should be formed by partial melting of the enriched mantle, while the Daye dacite was formed by partial melting of the Paleoproterozoic crustal material during the same period. Their formation is closely related to the extensional structure of the South China continent in the Late Mesozoic.
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Key words:
- Cretaceous /
- volcanic rocks /
- zircon U-Pb dating /
- geochemistry /
- Southeast Guangxi
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图 2 桂东南新州塘、大业研究区区域地质图（据广西1:5万区域地质图玉林幅、归义镇幅修改）
Fig. 2. Regional geological map of xinzhoutang and Daye research area in Southeast Guangxi(After the 1:50 000 regional geological map of Guangxi, the Yulin sheet and the Guiyi town sheet)
图 3 新州塘样品手标本及镜下显微照片
Pl. 斜长石；Hbl. 角闪石；Qtz. 石英；Bit. 黑云母；Px. 辉石
Fig. 3. Photographs of Hand specimens and micrographs of Xinzhoutang samples
图 4 大业样品手标本及镜下显微照片
Pl. 斜长石；Hbl. 角闪石
Fig. 4. Photographs of Hand specimens and micrographs of Daye samples
图 5 新州塘样品锆石CL图和锆石U-Pb年龄谐和图
左侧图片白色圆圈代表锆石U-Pb年龄选点，黄色圆圈代表锆石Hf同位素选点
Fig. 5. CL images and U-Pb concordia diagrams for zircons of Xinzhoutang samples
图 6 大业样品锆石CL图和锆石U-Pb年龄谐和图
左侧图片白色圆圈代表锆石U-Pb年龄选点，黄色圆圈代表锆石Hf同位素选点
Fig. 6. CL images and U-Pb concordia diagrams for zircons of Daye samples
图 7 新州塘、大业样品（a）Nb/Y-Zr/TiO2×1 000图解据（Winchester and Floyd, 1977）和（b）Co-Th图解（据Hastie et al., 2007）
Fig. 7. (a) Nb/Y-Zr/TiO2×1000 diagram (after Winchester and Floyd, 1977) and (b) Co-Th diagram (after Hastie et al., 2007) of the Xinzhoutang and Daye samples
图 8 新州塘、大业样品稀土元素球粒陨石标准化图解（a）（球粒陨石标准化值据Sun and Mcdonough, 1989）和微量元素原始地幔标准化图解（b）（原始地幔标准化值据Taylor and Mclennan, 1985）
Fig. 8. Normalized REE chondrite diagrams (a) (chondrite normalized values after Sun and Mcdonough, 1989)and normalized trace element primitive mantle diagrams (b) (The normalized values of the original mantle after Taylor and Mclennan, 1985) of the Xinzhoutang and Daye samples
图 9 新州塘、大业样品（a）t-εNd(t)图解（据孙涛等，2003）和（b）(87Sr/86Sr)i-εNd(t)图解(据Xie et al., 2012)
Fig. 9. t-εNd(t) diagram (a) (after Sun et al., 2003) and (87Sr/86Sr)i-εNd(t) diagram(b) (after Xie et al., 2012) of Xinzhoutang and Daye samples
图 10 新州塘、大业样品t-(176Hf/177Hf)图解（a）和t-εHf（t）图解（b）（据吴福元等，2007）
Fig. 10. t-(176Hf/177Hf) diagram (a) and t- εHf(t) diagram (b) (after Wu et al., 2007) of Xinzhoutang and Daye samples
图 11 新州塘、大业样品（a）La-La/Sm图解与（b）Zr-Zr/Y图解（据Pearce, 1984）
WPB. 板内玄武岩；MORB. 洋中脊玄武岩；IAB. 岛弧玄武岩
Fig. 11. La-La/Sm diagram(a) and Zr-Zr/Y diagram(b) (after Pearce, 1984) of Xinzhoutang and Daye samples
图 12 新州塘、大业中酸性岩Th/Hf-Ta/Hf图解（a）（据汪云亮等，2001）、La/Zr-Nb/Zr图解（b）（据武莉娜等，2003）
Fig. 12. Th/Hf-Ta/Hf diagram (a) (after Wang et al., 2001) and La/Zr-Nb/Zr diagram (b) (after Wu et al., 2003) of intermediate acid rocks in Xinzhoutang and Daye
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