Zircon U-Pb dating and geochemical features of Hangou granitic body in Xiaoshan Mountain, western Henan Province, and its geologic implications
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摘要:
韩沟二长花岗斑岩岩体位于崤山北部，其成因研究不仅可对崤山北部构造演化提供重要约束，而且可为区域找矿提供新思路。对韩沟岩体中黑云母二长花岗斑岩进行了LA-ICP-MS锆石U-Pb定年，20个测点的206Pb/238U年龄为142~147 Ma，加权平均年龄为（145.1±0.7）Ma。韩沟岩体具有高硅、富碱高钾、贫镁低钙的特征，属于富钾钙碱性花岗岩类（KCG）。韩沟岩体的稀土配分模式具有右倾、轻稀土富集及重稀土亏损的特征，（La/Yb）N范围为10.41~11.51，显示弱正Eu异常。韩沟岩体样品富集大离子亲石元素，亏损高场强元素Nb、Ta，在微量元素蛛网图上显示明显的Nb、Ta及Ti负异常。韩沟岩体具有高Sr、低Y和低Yb的特征，属于埃达克岩，Na2O和K2O含量表明其为C型埃达克岩。韩沟岩体是加厚大陆下地壳的部分熔融形成的，部分熔融源区的残余相矿物包括石榴石和金红石，且无（富钙）斜长石残留。崤山北部至少经历了~145 Ma和~130 Ma两次规模不等的岩石圈拆沉作用，韩沟岩体为~145Ma规模较小岩石圈拆沉作用的产物。韩沟岩体的形成时代与~145 Ma区域成岩成矿期相接近，在岩石圈拆沉作用这一灾变过程中，必然导致深部流体的大规模活动及其快速释放，表明韩沟岩体周缘及深部应具有较大的Au成矿潜力，其周缘11个Au矿床（点）就是最好的找矿证明。
Abstract:Hangou monzonitic granite porphyry body lies in northern Xiaoshan Mountain, western Henan Province. Petrogenetic research on Hangou rock body is important for recognizing tectonic evolution in northern Xiaoshan Mountain area, and it is also significant for estimating mineralization potential. The zircon U-Pb dating method of LA-ICP-MS was used to confirm the age of biotite monzonitic granite porphyry sample named LLHG01 from Hangou rock body. The results of 20 zircon spots are consistent with 207Pb/235U-206Pb/238U trend line, with 206Pb/238U ages being from 142 Ma to 147 Ma, and weighted average age being (145.1±0.7) Ma. Hangou rock body is characterized by higher SiO2 and alkali, enrichment of K2O, and lower MgO and CaO. Compositional spots of Hangou rock body fall into high-K calc-alkaline series in the SiO2-K2O diagram, and it belongs to K-rich calc-alkaline granite (KCG). In chondrite-normalized REE patterns, Hangou rock body samples have shown the characteristics of LREEenrichment and HREE depletion with trivial Eu positive anomaly, whose (La/Yb)N ratios are from 10.41 to 11.51. Samples from Hangou rock body are enriched in large ion lithophile elements and depleted in high field-strength elements, which has formed troughs of Nb, Ta and Ti in spider diagram. Samples of Hangou rock body have higher Sr and lower Y and Yb, suggesting that Hangou rock body is adakite. According to the content of Na2O and K2O, Hangou rock body is C-type adakite. Hangou rock body originated from partial melting of the thickened lower crust, and its residual phases of partial melting source included garnet and rutile, with no plagioclase. North Xiaoshan Mountain area underwent the process of lithosphere delamination of different scales in~145 Ma and~130 Ma, and Hangou rock body is a product of smaller scale lithosphere delamination that occurred at~145 Ma. The formation age of Hangou rock body falls into the time interval of~145 Ma stage of acid magmatism and endogenetic mineralization in western Henan Province. In the disaster process of lithosphere delamination in Hangou area, huge deep fluids were driven and discharged rapidly, suggesting that Hangou rock body and its concealed part have large mineralization potential. There are 11 Au deposits and Au mineralization spots around Hangou rock body, which constitute the best exploration evidence.
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图 1 豫西崤山韩沟岩体地质简图
a—河南省构造分区简图(据河南省地质矿产局，1989简化)：Ⅰ—华北克拉通，Ⅱ—秦岭造山带，F—栾川−确山−固始深大断裂带；b—豫西崤山北部地质简图(据河南省地质矿产局，1989简化)：1—新生界，2—元古宇官道口群，3—元古宇熊耳群，4—太古宇太华群，5—元古宙辉绿岩，6—中生代花岗岩，7—断层，8—Au矿床(点)(据刘传权，2000简化修改)，图中龙卧沟岩体和后河岩体的形成时代据卢仁等(2013, 2014)，白石崖岩体的形成时代据Liang et al., (2013)，小妹河岩体的形成时代据梁涛和卢仁(2015)；c—韩沟岩体地质简图(据文献❶简化)：1—新生界，2—元古界熊耳群火山岩系，3—中生代花岗岩，4—韩沟岩体K−Ar法定年样品位置及结果，5—样品LLHG01取样位置
Figure 1. Simplified geological map of Hangou rock body in Xiaoshan Mountain, western Henan Province
a-Simplified tectonic geological map of Henan Province (after Bereau of Geology and Mineral Resources of Henan Province, 1989): Ⅰ-North China craton, Ⅱ-Qinling orogen belt, F-Luanchuan−Queshan−Gushi huge fault belt; b-Simplified geological map of north Xiaoshan Mountain, western Henan Province (after Bereau of Geology and Mineral Resources of Henan Province, 1989): 1-Cenozoic, 2-Guandaokou Group (Pt2), 3 -Xiong' er Group (Pt2), 4-Taihua Group (Ar), 5-Diabase (Pt2), 6-Mesozoic granite, 7-Fault, 8-Au deposit (after Liu, 2000), ages of Longwugou body and Houhe rock body after Lu et al., (2013, 2014), Baishiya after Liang et al., (2013) and Xiaomeihe after Liang and Lu (2015); c-Simplified geological map of Hangou rock body (after reference ❶): 1-Cenozoic, 2-Xiong' er Group (Pt2), 3-Mesozoic granite, 4-Sampling location and result of K−Ar dating of Hangou rock body, 5-Sampling location of LLHG01
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图 2 韩沟岩体岩石照片
a—黑云母二长花岗斑岩；b—钾长石巨斑晶；c—斜长石斑晶，发育聚片双晶（正交偏光）矿物代号：Plg—斜长石
Figure 2. Petrographs of Hangou rock body
a-Biotite monzonitic granite porphyry; b-K-feldspar megacrysts in Hangou intrusion; c-Plagioclase and its polysynthetic twin; Plg—Plagioclase
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图 3 韩沟岩体样品LLHG01锆石阴极发光图像
Figure 3. Cathodoluminescence images of zircons in LLHG01 from Hangou rock body
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图 4 韩沟岩体样品LLHG01锆石U-Pb谐和曲线及定年结果
Figure 4. Concordia diagrams for U-Pb age of zircons in LLHG01 from Hangou rock body
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图 5 韩沟岩体Harker图解
数据1—本次研究样品；2—据李磊等，2013
Figure 5. Harker diagram of Hangou rock body
Data 1 are the results of the samples of this study; data 2 are from Li et al., 2013
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图 6 韩沟岩体SiO2-(Na2O+K2O)和SiO2-K2O图解
a—SiO2-(Na2O+K2O)图解（据Middlemost, 1989）：1—橄榄辉长岩，2—辉长岩，3—辉长闪长岩，4—闪长岩，5—花岗闪长岩，6—花岗岩，7—副长石辉长岩，8—二长辉长岩，9—二长闪长岩，10—二长岩，11—石英二长岩，12—副长石岩，13—副长石二长闪长岩，14—副长石二长正长岩，15—正长岩，16—副长石正长岩，图中碱性与亚碱性系列界线据Irvine and Baragar, 1971；b—SiO2−K2O图解（底图据Rollison, 1993）：1—钾玄岩系列，2—高钾钙碱性系列，3—钙碱性系列，4—低钾拉斑玄武系列。图中1—本次研究样品数据，2—据李磊等，2013
Figure 6. Diagrams of SiO2− (Na2O+K2O), and SiO2−K2O for Hangou rock body
a-Diagram of SiO2−(Na2O+K2O) (base map after Middlemost, 1989), 1-Peridotite gabbro, 2-Gabbro, 3-Gabbroic diorite, 4-Diorite, 5-Granodiorite, 6-Granite, 7-Foid monzo-gabbro, 8-Monzo-gabbro, 9-Monzo-diorite, 10-Monzonite, 11-Quartz Monzonite, 12-Foidolite, 13-Foid Monzo-diorite, 14-Foid Monzo-syenite, 15-Syenite, 16-Foid syenite. The boundary of alkaline and sub-alkaline after Irvine and Baragar, 1971; b-Diagram of SiO2−K2O (base map after Rollison, 1993), 1-Shoshonite series, 2-High−K calc-alkaline series, 3-Calc-alkaline series, 4-Low−K tholeiite series. In the map, data 1 are the results of the samples of this study; data 2 are from Li et al., 2013
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图 7 韩沟岩体稀土元素配分模式图和微量元素蛛网图
a—韩沟岩体球粒陨石标准化稀土元素配分模式图，球粒陨石标准化数据据Boynton, 1984；b—韩沟岩体微量元素蛛网图，标准化数据据Thompson, 1982；图中1—本次研究样品数据，2—据李磊等，2013
Figure 7. Diagrams of REE distribution pattern and spider diagram for Hangou rock body
a-Chondrite-normalized REE distribution patterns of Hangou rock body, chondrite values after Boynton, 1984; b-Chondrite-normalized spider diagram of Hangou rock body, and chondrite values after Thompson, 1982. In the map, data 1 are the results of the samples of this study; data 2 are from Li et al., 2013
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图 8 韩沟岩体的Y-Sr/Y图解和SiO2-MgO图解
a—韩沟岩体的Y-Sr/Y图解，Ⅰ—埃达克岩，Ⅱ—正常岛弧安山岩-英安岩-流纹岩(底图Defant et al., 2002)；b—韩沟岩体的SiO2−MgO图解，A—俯冲洋壳起源的埃达克岩，B—与橄榄岩混合的变玄武岩和榴辉岩的实验熔体，C—变玄武岩和榴辉岩的实验熔体(1.0~4.0 GPa)，D—加厚下地壳部分熔融起源的埃达克质岩石(底图据Wang et al., 2006)，图中数据1—据本文，2—李磊等，2013
Figure 8. Diagrams of Y−Sr/Y and SiO2−MgO for Hangou rock body
a-Y−Sr/Y diagram of Hangou rock body, Ⅰ-Adakites, Ⅱ-Arc andesites, dacites and rhyolite (base map after Defant et al., 2002); b-Diagram of SiO2−MgO for Hangou rock body, A-Subducted oceanic crust-derived adakites, B-Metabasaltic and eclogite experimental melts hybridized by peridotite, C-Metabasaltic and eclogite experimental melts (1.0~4.0 GPa), D-Thick lower crust-derived adakitic rocks (base map after Wang et al., 2006. In the map, data 1 are the results of the samples of this study; data 2 are from Li et al., 2013
表 1 韩沟岩体黑云母二长花岗斑岩样品LLHG01锆石LA-ICP-MS定年结果
Table 1 LA-ICP-MS dating results of zircons in LLHG01 biotite monzonitic granite porphyry of from Hangou rock body
下载: 导出CSV
表 2 韩沟岩体二长花岗斑岩样品主量元素(%)和微量元素(10-6)分析结果
Table 2 Major elements (%) and trace elements (10-6) analyses of monzonitic granite porphyry of Hangou rock body
下载: 导出CSV
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