Zircon U-Pb age, Lu-Hf Isotopic Characteristics and Origin of the Banshanping Granitoid Rocks in East Qinling Orogenic Belt

The Banshanping granitoid rocks distribute in the east of the North Qinling orogenic belt.It is a diorite-quartz diorite-granodiorite-granite series,spreading in a NW-SE direction,and intrudes into the Erlangping Group.The SiO2 content ranges from 57.04% to 76.56%,Na2O from 2.05% to 4.65%,K2O from 0.84% to 3.40%.Major element characteristics indicate that Banshanping granitoid rocks have properties of I type granotoids.SREE ranges from 36.51 ppm to 473.25 ppm,and LREE/ HREE ratios lie between 3.95 and 22.18.Negative Eu anomalies are not obvious in most samples,though there are obvious Nb,P and Ti positive anomalies.The zircon LA-ICP-MS ages of Banshangping granitoid rocks are 496.0±8.1 Ma-486.9±9.3 Ma.Hf isotope shows that 176Hf/177Hf ratios range from 0.282721 to 0.282876,εHf（t） values from 8.5 to 14,all positive,and corresponding modal ages （TDM2） range from 559 Ma to 908 Ma.Based on Hf isotope characteristics and existing SmNd and Rb-Sr isotope data,we consider that the Banshanping granitoid rocks originate from mantlederived material,i.e.the igneous rocks that formed in Neoproterozoic,and there may be a certain amount of crust-derived material during the formation of Banshanping granitoid rocks.

Ore mineral characteristics and zircon U-Pb geochronology of Yuanjiacun iron deposit in Shanxi

In order to further understand the ore characteristics and metallogenic age of Yuanjiacun iron deposit in Shanxi, the mineral composition characteristics of iron ore were studied on the basis of field investigation and microscopic observation. Magnetite, hematite, goethite and pyrite of different stages were identified according to their texture and structure features. Two sets of ^(207)Pb/^(206)Pb ages have been obtained by ICPMS isotope dating of magnetite quartzite, of which the zircon age with metamorphic origin is 1 916±88 Ma, representing the main metamorphic age of iron deposit. Another group of magmatic zircons with rhythmic zones are of 2 280±30 Ma age, representing the diagenetic age of iron formation. In addition, scattered age records after metamorphism indicate frequent hydrothermal events after mineralization. Based on the mineral fabric characteristics and the age data of zircons of different origins, it is known that the deposit has undergone sedimentary mineralization period, metamorphic mineralization period, hydrothermal mineralization period and weathering mineralization period.

Zircon U-Pb age and geochemical characteristics of granodiorites from the western Qilian block

1 Introduction Qilian Block is located in between the South China Craton and the North China Craton and the Tarim Craton(Fig.1a),which is one of the key area to study the tectonic evolution of China.The Phanerozoic tectonic framework

Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China

The Lunggar iron deposit belongs to the Bangong-Nujiang metallogenic belt and is located in central Lhasa on the Tibetan Plateau.In the Lunggar deposit,iron mineralization formed in the skarnization contact zone between the Early Cretaceous granodiorite and the late Permian Xiala Formation limestone.In this study,we achieved detailed zircon U-Pb-Hf isotopes and mineral chemistry for the Early Cretaceous granodiorite.Zircon U-Pb dating results indicate that the Early Cretaceous granodiorite emplaced at ca.119 Ma.Based on the trace elements in zircons and the mineral chemical composition of amphibole and biotite,the Early Cretaceous granodiorite was believed to form under condition of high temperature(>700°C),low pressure(100400 MPa),and relatively high oxygen fugacity(lgfO2)(13.6 to 13.9)and H2O content(4%8%).Zircon trace elements,Hf isotope and biotite chemistry collectively reveal that significant juvenile mantle-derived magmas contributed to the source of the granodiorite.The relatively high logfO2 and shallow magma chamber are beneficial for skarn iron mineralization,implying remarkable potential for further prospecting in the Lunggar iron deposit.

赣南铁山垅钨矿田花岗斑岩地球化学特征、锆石U-Pb年龄及Hf同位素特征

赣南铁山垅钨矿田位于南岭钨锡多金属成矿带东段,已探获黑钨矿资源量超10万吨。铁山垅复式岩体包括主体似斑状黑云母花岗岩和补体细粒二云母花岗岩两部分,花岗斑岩呈脉状分布。矿田内花岗岩具有相似的地球化学特征,都属过铝质高钾钙碱性花岗岩类,表现出高硅、富铝、富碱、高钾、富成矿元素(W、Sn、Cu、Mo)和亏损Ba、Sr、Ti、P、REE、Eu,稀土配分曲线呈典型的“海鸥式”分布和M型四分组效应等特征。利用LA-ICP-MS锆石U-Pb定年方法获得花岗斑岩^(206)Pb/^(238)U年龄为146.7±0.5 Ma(MSDW=0.5),成岩时代属晚侏罗世。锆石的n(^(176)Lu)/n(^(177)Hf)=0.000973~0.001989,f_(Lu/Hf)=-0.97~-0.94,ε_(Hf)(t)=-17.9~-10.3,二阶段模式年龄(TDM2)为1.86~2.33 Ga,显示原岩为古元古代地壳。综合分析认为,铁山垅矿田岩浆活动可划分为170~155 Ma、155~150 Ma、150~145 Ma三个阶段,钨锡矿成矿主要集中在第二阶段,且第三阶段花岗斑岩与铜多金属矿成矿关系密切,推测铜岭矿区深部具有较大的找矿前景。

鄂尔多斯盆地东南部韩城地区延长组碎屑锆石U-Pb年代学特征及物源指示意义

围绕鄂尔多斯盆地东南部中晚三叠世延长组物源演化,以盆地东南部韩城薛峰川地区延长组剖面为研究对象,运用碎屑锆石U-Pb年代学探讨了韩城地区延长期的物源特征。结果表明,韩城薛峰川地区延长组自下而上不同层段碎屑锆石U-Pb年龄谱峰特征基本一致,峰值段主要集中在晚古生代晚期(250~263 Ma)、古元古宙晚期(1 689~1 774 Ma, 1 867~1 885 Ma)和古元古宙早期(2 490~2 560 Ma),太古宙年龄仅零星分布,而中新元古宙和早古生代年龄均缺失。综合物源对比认为,韩城地区延长期盆地物源主要来自于其东北部的华北克拉通内部及阴山造山带地区,而华北板块南缘及秦岭地区的南部物源特征不明显。这种物源特征与盆地西南部延长期物源复杂多变的特点形成了鲜明对比,表明鄂尔多斯盆地东南部延长期具有稳定的东北物源特征,推测其南地区在延长期仍存在分隔南部物源的深湖相沉积,该认识对探讨延长期湖盆演化具有重要意义。

A Deep Mantle Source for the Late Neoarchean Metamorphosed Basalts in Eastern Hebei,North China Craton:Insights from Whole-Rock Geochemistry and Sm-Nd Isotopes,and Zircon U-Pb-Hf Isotopes

The basalts within the greenstone belt worldwide serve as an ideal target to decipher the nature of Archean mantle sources and further to extend the understanding of the early stages of Earth's evolution.To provide important insights into the issues,we carried out a detailed investigation of whole-rock geochemistry and Sm-Nd isotopes,and zircon U-Pb-Hf isotopes for the Late Neoarchean metamorphosed basalts in eastern Hebei,North China Craton.U-Pb isotopic dating using the LA-ICPMS on zircons reveals that the basalts in eastern Hebei erupted at ca.2.48-2.51 Ga and subsequently experienced multiple regional metamorphic events at 2477 and 1798 Ma,respectively.The metamorphosed basalts are featured by low SiO_(2),MgO,K_(2)O+Na_(2)O,and high Fe O contents,endowed with the subalkaline and high-Fe tholeiitic affinities.The radiogenic initial Nd and Hf isotope values and correlations among V,Ni and Cr contents strongly imply that the basalts experienced significant clinopyroxene and olivine fractionation and minor crustal contamination during magma evolution.They are also characterized by the relatively low total REE contents and exhibit significant depletions to moderate enrichments in the LREE contents,indicating the derivation from a deep mantle source in an Archean proto-mantle plume setting.

阿尔金山喀拉大湾地区早古生代火山岩岩石学特征、U-Pb年龄及构造环境特征

阿尔金山喀拉大湾地区出露一套海相火山岩,据火山岩组构特点及岩性组合划分出6个喷发韵律、3个喷发亚旋回、1个火山喷发旋回。通过对铅锌赋矿层顶底板晶屑凝灰岩进行锆石U-Pb测年,获得年龄为487.9~489.8 Ma,时代为晚寒武—早奥陶世。与铅锌矿有关的火山岩主要为钙碱性高钾英安岩、流纹岩类火山岩,岩石地球化学具Nb,Ta,Sr,Hf,Y相对亏损和Ba,Th,Zr,U相对富集及形成于俯冲带环境的钙碱性火山岩微量元素地球化学特征,即轻稀土富集,Eu极度亏损。结合前人研究成果,认为大地构造环境属拉张弧后盆地。

皖南歙县井潭组的年代学、地球化学特征及地质意义

新元古代早期,上扬子陆块和华夏陆块拼接为一个构造整体,形成一条呈向北西弧形突出的北东东—南西西向延伸的前南华纪基底出露带,延伸长度超过1500 km,出露宽度超过120 km,被称为“江南造山带”(Li Xianhua et al.,2009;周金城等,2014;韩瑶等,2016;周炜鉴等,2023)。井潭组位于江南造山带东北部,为江南造山带的重要组成部分,主要分布于黄山市—歙县井潭村以南地区,为一套酸性、中酸性、中性变质火山岩系。井潭组的形成时代及构造属性一直以来争议较大。

后马场镁铁-超镁铁岩体岩石成因及其对华北克拉通破坏的指示意义

文本通过对华北克拉通东南缘徐宿弧地区后马场镁铁质?超镁铁质岩体进行岩相学、锆石U-Pb年代学、单斜辉石和橄榄石矿物成分、全岩地球化学以及锆石Hf同位素研究,确定该岩体的形成时代、岩石成因及其构造环境,探究华北克拉通深部地幔性质及其演化过程。后马场岩体主要由辉长岩、橄长岩和橄榄辉长岩组成,其中辉长岩LA-ICP-MS锆石U-Pb年龄为109±2 Ma,指示该岩体形成于早白垩世晚期。不同岩性岩石的Si_(2)、CaO、Al_(2)O_(3)、Ti_(2)、Na_(2)O+K_(2)O与MgO呈明显的规律性变化,具有相似的主量元素特征,说明其为同源岩浆演化的产物。后马场岩体相对富集大离子亲石元素(Rb、Ba、Sr),亏损高场强元素(Nb、Ta、Zr、Hf、Ti),具有典型的岛弧型岩浆特征。辉长岩中锆石的ε_(Hf)(t)值为–14.5~5.6,大部分为负值,说明岩浆源区以富集地幔占主导,同时也具有亏损地幔的特征。微量元素Nb/U-Ce/Pb模拟计算结果显示,岩浆发生了80%~90%的上地壳混染,然而岩浆无法同化混染如此高比例的上地壳物质,因此部分地壳物质可能是通过陆壳俯冲并进行源区交代作用进入岩浆。岩石的La/Ba、Th/Yb值与俯冲交代岩石圈地幔相似,Nb/Zr、Th/Zr、Rb/Y和Nb/Y值显示俯冲熔体交代的特征,指示俯冲扬子陆壳衍生熔体交代了岩石圈地幔,在白垩纪古太平洋俯冲板片回卷,岩石圈地幔受到上涌的软流圈地幔的加热,产生的镁铁质岩浆形成了后马场岩体。区域镁铁质岩石锆石ε_(Hf)(t)值的变化规律指示后马场岩体侵位时期是华北克拉通东南缘地幔源区由富集地幔向亏损地幔转折的关键期,在此之后,镁体质岩浆主要源于亏损地幔,因此华北克拉通东南缘早白垩世晚期镁铁质岩浆指示岩石圈地幔源区性质由富集向亏损转变的结束,也代表着华北克拉通破坏的结束。

The late Early-Paleozoic granitic magmatism in Northwestern Fujian, China: constraints on intraplate orogeny in the South China block

The Early Paleozoic tectono-thermal event was a significant orogenic activity during the Phanerozoic era,which had a profound impact on the early crust of the South China Block(SCB) and established the foundation for later tectonic activity.The Wuyi-Yunkai orogenic belt in Southeastern China was extensively exposed to Early Paleozoic magmatism,the genetic mechanism of which remains controversial.To shed light on this issue,detailed petrological,geochemical,and zircon U-Pb-Hf isotopic studies were carried out on two granitoids,namely the Yuntongshan pluton and the Gaoqiao pluton,identified in the central Wuyishan.Zircon U-Pb chronology of the Yuntongshan and Gaoqiao bodies yielded ages of437±4 Ma(MSWD=2.2) and 404±2 Ma(MSWD=12),respectively,indicating that they were emplaced during the Early Silurian and Early Devonian periods.These granitoids are primarily composed of biotite-granite and biotite-monzonitic-granites,with high concentrations of S_(i)O_(2)(73.59-75.91 wt%),K_(2)O+Na_(2)O(8.31-8.73wt%),and low contents of MgO,CaO,Cr,Ni.They are classified as high-K calc-alkaline and weakly metaluminous-strongly peraluminous S-type granites.These granitoids are enriched in light rare earth elements(LREEs) and large ion lithophile elements(LILEs) and depleted in heavy rare earth elements(HREEs) and high field strength elements(HFSEs) with arc affinity.The εHf(t) values of-3.3 to-15.4 with two-stage Hf model ages ranging from 2829 to 1644 Ma,combined with the presence of Neoproterozoic inherited zircons,suggest that the primary magma of these granitoids was derived from the partial melting of Neoproterozoic crust with a Paleoproterozoic crustal model age.These findings,combined with the spatio-temporal distribution of regional magmatism,reveal that the late Early-Paleozoic granitoids formed in the intraplate orogenic background originating from the subduction of the proto-Tethys Ocean and proto-Pacific Ocean around the margin of the east Gondwana supercontinent.

北大别木子店地区早白垩世辉长岩地球化学特征及其对构造环境的指示

为揭示大别造山带基性岩的成因及构造背景,应用LA-ICP-MS锆石定年和地球化学分析,探讨了北大别木子店地区雷家湾辉长岩的成岩年龄、地球化学特征,并通过与安徽段基性—超基性岩对比,揭示了大别造山带基性—超基性岩成因和构造环境。结果显示,北大别木子店地区雷家湾辉长岩成岩年龄为122.3±1.0 Ma。雷家湾辉长岩的SiO2含量介于45.00%~50.69%之间,平均值为48.02%;Mg#值变化范围在45.62~53.49之间,平均值为47.86;K2O+Na2O含量变化于4.68%~7.03%之间,平均值为6.31%,属于碱性系列;富集Rb、Ba、K、Sr等大离子亲石元素(LILE)和轻稀土元素,亏损Ta、Nb、Zr、Ti等高场强元素(HFSE)和重稀土元素;与安徽段基性—超基性岩具有相似的野外特征和岩石地球化学性质。岩石成因研究显示,雷家湾辉长岩的幔源母岩浆有地壳物质的加入,作用方式应该为源区的混合,地壳物质的加入可能与三叠纪以来扬子板块向华北板块俯冲后加厚岩石圈的拆沉作用有关。大别造山带130 Ma左右基性—超基性岩的出现可能暗示构造体制由挤压向伸展转换。

新疆伊宁地块坎苏一带LA-ICP-MS锆石U-Pb年龄新资料及其地层归属

新疆伊宁地块坎苏一带原划泥盆纪坎苏组(变质)火山岩缺乏时代依据,前人或将其归为长城纪,或归为中—晚泥盆世,或归为晚石炭世,地层名称和区域对比也受此影响使用极混乱。在本区进行1∶5万区域地质调查时,对该套地层进行了层序恢复、原岩恢复,并对火山岩类进行了元素地球化学分析和LA-ICP-MS锆石U-Pb定年。研究认为,该套原划泥盆纪坎苏组(变质)火山岩中浅紫红色粗面岩和灰白色云母化英安岩锆石U-Pb年龄分别为315.6±1.6 Ma和306.6±1.2 Ma,侵入于火山岩中的正长花岗岩锆石U-Pb年龄为298.2±1.5 Ma,限定该套火山岩地质时代为晚石炭世。该套火山岩尽管遭受了较强烈的花岗岩类叠加变质和混染作用,但仍显示出大陆裂谷构造环境信息,总体与区域上的晚石炭世伊什基里克组可对比。据此,将原划泥盆纪坎苏组新厘定为晚石炭世伊什基里克组,为该套火山地层时代归属及区域对比提供了确凿证据。

Robust Timing Constraints for Granitic Magmatism and Hydrothermal Mineralization in the Tieshanlong W-Sn Ore Field,Eastern Nanling Range,South China

The Tieshanlong ore field is an important part of the Nanling Range,which is famous worldwide for its W-Sn mineralization.Notably,the mineralization age of the Tieshanlong ore field is not well constrained,and our field investigation reveals that granitic emplacement occurred at different stages.However,previous studies have not distinguished these multiple stages of magmatism.The Tieshanlong granite complex is closely related to the Huangsha quartz vein-type W-Sn deposit and Tongling skarn-type Cu-W-Sn deposit in this field.Through field investigations and isotopic age analyses,this work studies the relationship between multistage magmatic activity and mineralization in the Tieshanlong ore field.LA-ICP-MS zircon U-Pb isotope analyses revealed that the first-and second-staged granites formed at 154.2±0.6 Ma(MSDW=1.4)and 151.2±0.4 Ma(MSDW=1.5),with zirconε_(Hf)(t)values ranging from-13.1 to-10.5 and from-14.7 to-11.1,respectively.These data suggest that the Tieshanlong granite complex was derived from the partial melting of ancient crustal material.LA-ICP-MS U-Pb dating of wolframite and cassiterite reveals that W-Sn mineralization occurred at 160-150 Ma,which agrees well with the U-Pb dating results of the second-staged granite within analytical errors.The magmatic activity in this ore field can be divided into three stages:175-154 Ma,154-150 Ma and 150-145 Ma.The quartz vein-and skarn-type W-Sn mineralization is closely related to second-staged fine-grained twomica granite,and formed earlier than skarn-type Cu-mineralization.This study establishes a metallogenic model for the Tieshanlong ore field,and this model has important practical significance for identifying concealed W-Sn(-Cu)deposits around other granitic complexes in the Nanling Range.

胶东地区早白垩世周官高镁闪长岩体年代学、地球化学特征及其构造意义

胶东地区是我国最重要的金矿集区,金矿床的时空分布与晚中生代花岗岩类密切相关,其中早白垩世伟德山期花岗岩侵位时间与大规模金成矿时间一致,是重要的成矿期地质体。隶属于伟德山期花岗岩的周官岩体与金成矿时空关系密切。选择周官岩体作为研究对象,系统开展了岩石学、锆石U-Pb同位素测年和全岩地球化学研究工作。结果表明:周官岩体侵位时代为(119.4±1.1)~(118±1.0)Ma,与金成矿同期;岩体具有低硅、高镁和富钠,以及相对高的Cr、Ni、Co、Sc含量、Sr/Y比值和明显贫化的Zr含量特征,Mg#值介于55.83~59.26,表现为高镁闪长岩特征。岩石属高钾钙碱性系列,为高镁闪长岩类,岩浆源于富集岩石圈地幔的部分熔融,并混染了部分地壳物质;周官高镁闪长岩体和伟德山期花岗岩的岩浆侵位导致地壳浅部发生剧烈隆起,形成伸展构造,为成矿流体运移、成矿物质富集和矿体定位提供了良好通道和有利空间。

内蒙古伊和花金矿岩体锆石U-Pb年龄及意义

伊和花金矿位于内蒙古自治区乌拉特中旗境内,为华北陆块北缘白云鄂博群中发育的一个岩浆热液型金矿。在矿床成矿地质背景、矿床地质特征的研究的基础上,对于成矿相关的二长闪长岩岩体进行了年代学研究,以期为研究华北陆块北缘金矿成矿规律以及金矿找矿突破提供依据。

冀西北宣化盆地髫髻山组粗面岩年代学、地球化学特征及其地质意义

冀西北髫髻山组火山—沉积地层发育,但生物化石匮乏,前人同位素测年资料不足且测年方法陈旧,致使其形成时代一直存在争议。为了准确确定该组地层的形成时代,研究其形成的区域大地构造背景,笔者对宣化盆地髫髻山组的岩性组合开展了详细的野外调查,对地层上部粗面质火山岩开展了岩石学、岩石地球化学及高精度同位素测年研究,获得了161.1±1.2 Ma和162.5±1.3 Ma的LA-ICP-MS锆石U-Pb同位素年龄;岩石学、岩石地球化学特征表明,上部粗面质火山岩为钾玄岩系列,岩石具有轻稀土元素富集,Rb、K、Th、Ce、Zr、Hf等元素相对富集,Ba、Nb、Sr、P、Ti相对亏损的特征;通过主要参数对比和图解判别,确定岩浆主要源于大陆地壳物质熔融,粗面质火山岩形成于挤压大陆边缘火山弧构造背景。综合研究认为,髫髻山组主要形成于中侏罗世,并延续至晚侏罗世,其上部粗面质火山岩形成于板内挤压构造背景,该成果对中生代火山岩—沉积地层划分对比及形成环境研究补充了新资料。

阿尔金造山带阿中地块塔什达坂西花岗岩体岩石地球化学特征、锆石U-Pb年龄及其地质意义

分布于阿尔金造山带阿中地块北缘中新元古界隆起带的库木达坂岩体,为一规模较大的复式岩体。近年来,随着一批以黄龙岭超大型锂矿床为代表的、围绕该岩体产出的大中型锂矿床的发现,使得该区成为新的找矿热点区带。笔者在1∶5万区域地质调查中从原库木达坂岩体解体出的新侵入体,该岩体位于塔什达坂西,岩性以粗粒二云母二长花岗岩为主。前人关于该岩体的研究较少,本文通过对岩体进行岩石学、岩石地球化学、同位素年代学研究,探讨该岩体岩浆作用及地质意义。研究表明,塔什达坂西花岗岩体具高硅、富钾、相对贫钠特征,铝饱和指数大于1.1,属过铝质高钾钙碱性花岗岩系列。稀土元素总量较低,轻稀土元素相对富集、重稀土元素亏损,有右倾型特征和明显的负Eu异常。富集Rb、Th、U、K等大离子亲石元素,亏损Ba、Sr、Ti等,具典型S型花岗岩特征。推断其是在温度为~726°C,压力<8 kbar的条件下,由地壳泥质岩系部分熔融的产物。粗粒二云母二长花岗岩锆石U-Pb年龄为(466.5±3.0)Ma,侵位时代为中奥陶世。岩体形成于同碰撞构造环境,推断其为南阿尔金洋闭合后陆-陆碰撞的产物。

坦桑尼亚卢帕地体花岗岩岩石地球化学特征、锆石U-Pb年代学及其构造意义

【研究目的】卢帕地体是坦桑尼亚第二大金矿集区所在地,对于其形成时代及成因机制争议较大。【研究方法】本次通过锆石年代学和地球化学特征分析,厘定卢帕地体花岗岩的形成时代和成因机制。【研究结果】锆石U-Pb年代学研究表明卢帕地体内花岗岩有两类:新太古代花岗岩类,年龄为2663±22 Ma~2778±13 Ma;古元古代花岗岩年龄为1944±10 Ma~2006±10 Ma,地球化学特征与I型花岗岩相似。卢帕地体内分布的其它基性岩、碳酸岩等代表了罗迪尼亚超大陆裂解开始的时间。【结论】岩石地球化学特征表明非A型花岗岩,其物质来源并非来自地幔,而是地壳重熔的结果。花岗岩构造环境判别图解显示,样品投影落在火山弧花岗岩中,花岗岩集中于大陆花岗岩区域,远离大洋花岗岩、大洋玄武岩和辉长岩区域,新太古代与古元古代的花岗岩形成于大陆边缘弧。

粤北漂塘坳岩体锆石U-Pb年龄、地球化学特征及成因探讨

粤北漂塘坳岩体位于诸广山岩体南部,该岩体与铁成矿关系密切,研究程度较低,且期次划分及成因尚存在较多的争论。通过分析粤北漂塘坳岩石地球化学及LA-ICP-MS锆石U-Pb年龄,结果显示:岩石硅、钾、钠含量较低,ω(SiO_(2))为49.92%~53.41%,ω(K_(2)O)为0.93%~2.34%,ω(Na_(2)O)为0.72%~1.60%;铁、镁、钙含量丰富,ω(TFeO)为7.69%~10.08%,平均9.07%,ω(MgO)为10.53%~18.14%,平均13.07%,ω(CaO)为7.67%~11.38%,平均9.32%;稀土元素总量(ΣREE)为83.11×10^(-6)~222.71×10^(-6),配分模式大致右倾;Eu亏损较明显,δEu值偏高0.76~0.89,平均值为0.82;富集不相容元素Rb、K、U、P,较明显亏损Ba、Sr、Ti;LA-ICP-MS锆石年龄为429.0±12 Ma。上述分析结果表明,漂塘坳岩体属于壳幔混合型花岗岩,是早志留世岩浆活动的产物,岩浆主要来源地壳物质及部分地幔物质的熔融。