Zircon U-Pb age of granitoid from the Chiwawu Cu-Woccurence Northern Taihang Mountain and its implications
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摘要:
太行山北段位于华北克拉通中部，以发育中生代中酸性岩浆岩及多个大中型斑岩-矽卡岩铜钼矿床和金矿床为主要特征，最近在南部赤瓦屋岩体内部发现新类型铜钨矿体。文章选择赤瓦屋岩体为对象，开展不同岩相详细的野外地质和锆石U-Pb测年工作，确定赤瓦屋岩体不同岩性的成岩时代，探讨其地质意义。研究表明，赤瓦屋岩体有边缘相石英闪长岩、边缘相花岗闪长岩和中心相斑状花岗闪长岩及晚期中酸性岩脉，其中铜钨矿化主要发育于中心相斑状花岗闪长岩。石英闪长岩、花岗闪长岩、斑状花岗闪长岩和花岗闪长斑岩脉的锆石U-Pb谐和年龄分别为（134±1）Ma、（133±1）Ma、（131±2）Ma和（128±1）Ma，表明赤瓦屋岩体不同岩相体形成于早白垩世（134~131 Ma）。结合区域年代学资料，提出太行山北段晚中生代至少存在两期岩浆-成矿事件。
Abstract:The Northern Taihang Mountain is located in the central part of North China Carton, characterized by Mesozoic intermediate-acid magmatic rocks and plenty of important porphyry-skarn Cu-Mo deposits and hydrothernal gold deposits. A new Cu-W orebody within the Chiwawu granitoid was recently discovered in the southernmost part. The authors conducted field survey and zircon U-Pb dating of different granitic petrofacies from the Chiwawu Cu-W ore district, and then used the data obtained to constrain the timing and origin of granitc rocks. The Chiwawu pluton shows obviously textural and compositional variation from the inner part to the outer part, ranging from porphyritic granodiorite at the inner part, granodiorite at the transition part to quartz diorite at the periphery and several porphyry dykes. These new zircon LA-ICPMS U-Pb analyses of quartz diorite, granodiorite, porphyritic granodiorite and granodiorite porphyry dyke yielded excellent concordant ages of 134±1 Ma, 133±1 Ma,131±2 Ma and 128±1 Ma, respectively, indicating that the Chiwawu pluton was formed during the Early Cretaceous period (134-131 Ma). Combined with available chronologic data, the authors recognized two regional magmatic-metallogenic events during the Mesozoic time in Northern Taihang Mountain.
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Keywords:
- Northern Taihang Mountain /
- Chiwawuv pluton /
- Cu-Woccurence /
- zircon U-Pb dating
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1. 研究目的（Objective）
松科二井，获取了从基底—火石岭组—沙河子组—营城组—登娄库组下部连续完整的原位岩心。本文对松科二井沙河子组上部的孢粉化石进行研究，为研究白垩纪地球温室气候和环境变化，建立服务“百年大庆”目标和基础地质研究的“金柱子”提供基础资料。
2. 研究方法（Methods）
孢粉样品采自松科二井3395.46~3901.35 m，岩性为黑色、灰黑色泥岩、粉砂质泥岩，层位为沙河子组上部。孢粉分析鉴定在吉林大学古生物学与地层学研究中心完成，具体过程为：每个样品取过筛的干样50 g，进行盐酸→氢氟酸→氢氧化钾→盐酸→硝酸→氢氧化钾→盐酸等分析处理，用筛选法将样品中的孢粉化石集中在试管中，制2个固定片在生物显微镜下鉴定。
3. 研究结果（Results）
依据松科二井3395.46~3901.35 m井段的孢粉化石演化特征，划分出两个孢粉组合。
（1）Leiotriletes sp.- Cyathidites australis - Chasmatosporites sp.组合（简称LCC组合），分布在3832.94~3901.35m井段。蕨类孢子占绝对优势，裸子类花粉较低，未见被子类花粉。蕨类孢子含量最高的是Cyathidites australis，其次是Leiotriletes sp.和Cyclogranisporites sp.，有时代意义的还有Cicatricosisporites exilis、C. minutaestriatus、C. splendidus、C.australiensis、Klukisporites sp.、Maculatisporites sp.、Triporoletes singularis、Trilobosporites tribotrys、Aequitriradites sp.和Polycingulatisporites reduncus等；裸子类花粉含量最高的是Chasmatosporites sp.，其次是Psophosphaera sp.，有时代意义的类型有Parvisaccites sp.、Erlianpollis minisculus、Paleoconifersp.、Pseudowalchia sp.和Classopollis sp.等。
（2）Klukisporites triangulus- Aequitriradites sp.- Pristinuspollenites sp.组合（简称KAP组合），分布在3395.46~3613.62 m井段。裸子类花粉百分含量（53.03%~72.13%）较高，其次为蕨类孢子（27.87% ~46.97%），未见到被子类花粉。裸子类花粉中含量最高的是Alisporites parvus，其次是Piceaepollenites sp.，含量较高的类型还有Chasmatosporites sp.、Pinuspollenites divulgatus和P. sp.等，有时代意义的还有Parvisaccites otagoensis、Erlianpollis minisculus、E. mediocris、Jiaohepollis sp.和Classopollis classoides等。蕨类孢子含量最高的是Klukisporites sp.，其次是Leiotriletes sp.和Cyathidites australis，含量较高的类型还有Cyclogranisporites sp.等，有时代意义的有Cicatricosisporites exilis、C.apiteretus、C. australiensis、Klukisporites triangulus、K.variegatus、Pilosisporites scitulus、Impardecispora sp.、Levisporites wulinensis、Triporoletes singularis、Trilobosporites humilis、Aequitriradites sp.和Schizaeoisporites sp.等。
含有早白垩世特有或在早白垩世繁盛的分子：Cicatricosisporites、Klukisporites、Pilosisporites、Maculatisporites、Impardecispora、Levisporites、Triporoletes、Trilobosporites、Aequitriradites、Schizaeoisporites、Polycingulatisporites、Parvisaccites、Paleoconiferus、Erlianpollis、Foveotriletes.和Classopollis等（图 1）。
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图 1 松科二井沙河子组部分孢粉化石（1-Cicatricosisporites exilis，样品号：SK2-375；2. -Cicatricosisporites minutaestriatus，标品号：SK2-385；3-Cicatricosisporites splendidus，标品号：SK2-385；4-Cicatricosisporites australiensis，样品号(sample number)：SK2-375；5-Levisporites wulinensis，样品号(sample number)：SK2-205；6. Aequitriradites sp.，样品号(sample number)：SK2-389; 7-Trilobosporites tribotrys，样品号(sample number)：SK2-389；8- Classopollis classoides，标品号：SK2-97；9-Erlianpollis minisculus，样品号(number)：SK2-395; 10. Parvisaccites sp.，样品号：SK2-395；11. Pilosisporites scitulus，标品号：SK2-201；12-Triporoletes asper，标品号(specimen number)：SK2-219；13. Foveotriletes subtriangulularis，样品号：SK2-219；14-Klukisporites triangulus，样品号(sample number)：SK2-205；15-Impardecispora sp.，样品号：SK2-201; 16-Schizaeoisporites polaris，样品号：SK2-173；17-Polycingulatisporites reduncus，标品号：SK2-395；18-Maculatisporites sp.，样品号：SK2-391。19-Chasmatosporites sp.，样品号：SK2-389; 20-Paleoconiferae sp.，样品号(sample number)：SK2-391;线段比例尺为10 μm, the scale of the line segment is 10 μm）Figure 1. Spores and pollen from the Lower Cretaceous Shahezi Formation in Well SK2上述2个孢粉组合分布在，属沙河子组上部，LCC组合蕨类孢子百分含量占绝对优势，裸子类花粉较少，从组合特点来看，可以与高瑞琪等人建立的沙河子组上部Granulatisporites-Lophotriletes-Cicatricosisporites组合大致对比，但上部的KAP组合层位显然高于高瑞琪等人建立的孢粉组合。与高瑞琪等人建立的孢粉组合相比，当前孢粉组合出现的有时代意义的孢粉类型更多且时代更新。
4. 结论（Conclusions）
两个孢粉组合海金砂科孢子繁盛，类型多样化，没有发现早期被子植物花粉；虽在蕨类孢子与裸子类花粉的百分含量及属种构成上明显不同，但出现的有时代意义的化石类型基本相同，其时代均为早白垩世早期。
5. 致谢（Acknowledgement）
本文为国家自然科学基金项目（41790451)和中国地质调查局项目（DD20190097）共同资助。孢粉化石由张淑琴研究员鉴定。
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图 2 太行山北段赤瓦屋地区地质简图
Figure 2. Sketch geological map of Chiwawu area in Northern Taihang Mountain
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图 3 太行山北段赤瓦屋地区4 种不同岩性的手标本照片
Figure 3. Photo for four different petrologic characters of granitoids in Chiwawu area of Northern Taihang Mountain
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图 4 太行山北段赤瓦屋地区不同岩相花岗质岩体锆石U-Pb谐和图
Figure 4. Zircon LA-ICPMS U-Pb concordia diagrams for different petrofacies of granitoids in the Chiwawu area of NorthernTaihang Mountain
表 1 太行山北段赤瓦屋铜钨矿区不同岩相的花岗质岩石的锆石U-Pb年龄测年结果
Table 1 LA-ICPMS zircon U-Pb data of different petrofacies of granitoids in Chiwawu area,Northern Taihang Mountain
下载: 导出CSV
表 2 太行山北段晚中生代侵入岩的锆石U-Pb年龄
Table 2 Compilation of isotopic ages for important Late Mesozoic intrusions in Northern Taihang Mountain
下载: 导出CSV
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期刊类型引用(6)
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