Paleozoic Accretion-Collision Events and Kinematics of Ductile Deformation in the Eastern Part of the Southern-Central Tianshan Belt, China

The Tianshan range could have been built by both late Early Paleozoicaccretion and Late Paleozoic collision events. The late Early Paleozoic Aqqikkudug-Weiya suture ismarked by Ordovician ophiolitic melange and a Silurian flysch sequence, high-pressure metamorphicrelics, and mylonitized rocks. The Central Tianshan belt could principally be an Ordovician volcanicarc; whereas the South Tianshan belt, a back-arc basin. Macro- and microstructures, along withunconformities, provide some kinematic and chronological constraints on 2-phase ductile deformation.The earlier ductile deformation occurring at ca. 400 Ma was marked by north-verging ductileshearing, yielding granulite-bearing ophiolitic melange blocks and garnet-pyroxene-facies ductiledeformation, and the later deformation, a dextral strike-slip tectonic process, occurred during theLate Carboniferous-Early Permian. Early Carboniferous molasses were deposited unconformably onpre-Carboniferous metamorphic and ductilely sheared rocks, implying the end of the early orogeny.The large-scale ductile strike-slip along the Aqqikkudug-Weiya zone was possibly caused by thesecond tectonic event, the Hercynian collision between the northern Tarim block and the southernSiberian block. Late Paleozoic granitic magmatism and superimposed structures overprinted this EarlyPaleozoic deformation belt. Results of geometric and kinematic studies suggest that the primaryframework of the Southern-Central Tianshan belt, at least the eastern part of the Tianshan belt, wasbuilt by these two phases of accretion events.

Geochemical and Petrological Studies on the Early Carboniferous Sidingheishan Mafic-Ultramafic Iintrusion in the Southern Margin of the Central Asian Orogenic Belt,NW China

The Sidingheishan mafic-ultramafic intrusion is located in the eastern part of the Northern Tianshan Mountain, along the southern margin of the Central Asian Orogenic Belt in northern Xinjiang autonomous region of China. The Sidingheishan intrusion is mainly composed of wehrlite, olivine websterite, olivine gabbro, gabbro and hornblende gabbro. At least two pulses of magma were involved in the formation of the intrusion. The first pulse of magma produced an olivine-free unit and the second pulse produced an olivine-bearing unit. The magmas intruded the Devonian granites and granodiorites.An age of 351.4±5.8 Ma(Early Carboniferous) for the Sidingheishan intrusion has been determined by U-Pb SHRIMP analysis of zircon grains separated from the olivine gabbro unit. A U-Pb age of 359.2±6.4 Ma from the gabbro unit has been obtained by LA-ICP-MS. Olivine of the Sidingheishan intrusion reaches 82.52 mole% Fo and 1414 ppm Ni. On the basis of olivine-liquid equilibria, it has been calculated that the MgO and FeO included in the parental magma of a wehrlite sample were approximately10.43 wt% and 13.14 wt%, respectively. The Sidingheishan intrusive rocks are characterized by moderate enrichments in Th and Sm, slight enrichments in light REE, and depletions in Nb, Ta, Zr and Hf. The εNd(t) values in the rock units vary from +6.70 to +9.64, and initial87Sr/86Sr ratios range between 0.7035 and0.7042. Initial206Pb/204Pb,207Pb/204Pb and208Pb/204Pb values fall in the ranges of 17.23-17.91,15.45-15.54 and 37.54-38.09 respectively. These characteristics are collectively similar to the Heishan intrusion and the Early Carboniferous subduction related volcanic rocks in the Santanghu Basin, North Tianshan and Beishan area. The low(La/Gd)PMvalues between 0.26 and 1.77 indicate that the magma of the Sidingheishan intrusion was most likely derived from a depleted spinel-peridotite mantle.(Th/Nb)PMratios from 0.59 to 20.25 indicate contamination of the parental magma in the upper crust.Crystallization modeling methods suggest that the parental magma of the Sidingheishan intrusion was generated by flush melting of the asthenosphere and subsequently there was about 10 vol%contamination from a granitic melt. This was followed by about 5 vol% assimilation of upper crustal rocks. Thus, the high-Mg basaltic parental magma of Sidingheishan intrusion is interpreted to have formed from partial melting of the asthenosphere during the break-off of a subducted slab.

Continental reconstruction and metallogeny of the Circum-Junggar areas and termination of the southern Central Asian Orogenic Belt

Continental reconstructions in Central Asia are represented by orogenesis along some large orogenic belts in the Altaid collage （Fig. 1 ） or Central Asian Orogenic Belt （CAOB）, which separate the East European and Siberian cratons to the north from the Tarim and North China cratons to the south （$eng0r et al,, 1993; Jahn et al., 2004; Windley et al., 2007; Qu et al., 2008; Xiao et al., 2010; Xiao and Santosh, 2014）. The Altaid Collage was characterized by complex long tectonic and structural evolution from at least ca. 1.0 Ga to late Paleozoic-early Mesozoic with considerable continental growth （Khain et al., 2002; Jahn et al., 2004; Xiao et al., 2009, 2014; KrOner et al., 2014）, followed by Cenozoic intracontinental evolution related to far-field effect of the collision of the In- dian Plate to the Eurasian Accompanying with these complex world-class ore deposits developed 2001; Goldfarb et al., 2003, 2014）. Plate （Cunningham, 2005）. geodynamic evolutions, many （Qin, 2000; Yakubchuk et al,2001; Goldfarb et al., 2003, 2014）.

SHRIMP Zircon U-Pb Age of the Sidingheishan Mafic-Ultramafic Intrusion in the Southern Margin of the Central Asian Orogenic Belt,NW China and its Petrogenesis implication

Objective The Sidingheishan mafic-ultramafic intrusion is located in the eastern part of the North Tianshan Mountains. This work used zircon U-Pb age data, bulk rock major and trace elements, Sr-Nd-Pb isotope data to assess mantle source characteristics and crustal assimilation of the parental magma of the Sidingheishan intrusion. We have also discussed the tectonic evolution of the southern margin of the Central Asian Orogenic belt in the Late Paleozoic.

中亚造山带南蒙古地区石炭纪--二叠纪岩浆活动及其构造意义

中亚造山带作为显生宙以来全球最大的增生型造山带,记录了古亚洲洋俯冲、增生、闭合的全过程。南蒙古地区位于中亚造山带南缘中段,其晚古生代先后发育弧岩浆活动以及与伸展活动相关的岩石组合,是研究陆壳增生和改造的热点区域。笔者结合区域地质特征及前人研究对南蒙古地区石炭纪--二叠纪这一关键时期的岩石组合做出系统梳理和总结,研究区石炭纪--二叠纪岩浆活动大致可以分为早石炭世(350~325 Ma),晚石炭世(320~305 Ma)和早二叠世(300~280Ma)3个阶段。早石炭世(350~325Ma)发育典型的弧岩浆岩且具有向南变年轻的趋势。此外,全岩Nd和锆石Hf同位素显示其主体具有显著的地幔贡献。综合前人认识,笔者认为这是古亚洲洋主洋盆以北多个次生的弧后洋盆俯冲后撤的结果。晚石炭世(320~305Ma)以高硅花岗岩为主,尤其315~310Ma的碱长花岗岩、碱长正长岩等是年轻弧地体重熔的产物,是俯冲大洋板片显著消耗的结束。早二叠世(300~280Ma)发育伸展相关的岩石组合(如A型花岗岩、双峰式火山岩和基性岩墙),这些岩浆活动显示高温特征,且具有显著的地幔物质贡献。结合前人工作,特别是笔者的前期工作,上述岩浆活动是由石炭纪板片后撤之后高角度俯冲诱发的俯冲板片断离所造成,且前人研究成果表明南蒙古东西两侧均有类似的岩石、构造和沉积记录。因此,笔者提出,古亚洲洋主洋盆泥盆纪--二叠纪多期次的俯冲后撤导致了其北侧一系列次生的弧后洋盆的开启、俯冲至闭合,上述过程伴随了中亚造山带南缘最后一次大规模侧向增生及其结束后板片断离诱发的垂向地壳增生。

Mesozoic Tectonothermal Evolution of the Southern Central Asian Orogenic Belt: Evidence from Apatite Fission-Track Thermochronology in Shalazha Mountain, Inner Mongolia

Mesozoic intracontinental orogeny and deformation were widespread within the southern Central Asian Orogenic Belt(CAOB). Chronological constraints remain unclear when assessing the Mesozoic evolution of the central segment of this region. The tectonic belt of Shalazha Mountain located in the center of this region is an ideal place to decode the deformation process. Apatite fission-track(AFT) thermochronology in Shalazha Mountain is applied to constrain the Mesozoic tectonothermal evolution of the central segment of southern CAOB. The bedrock AFT ages range from 161.8 ± 6.9 to 137.0 ± 7.3 Ma, and the first reported detrital AFT obtained from Lower Cretaceous strata shows three age peaks: P1(ca. 178 Ma), P2(ca. 149 Ma) and P3(ca. 105.6 Ma). Bedrock thermal history modeling indicates that Shalazha Mountain have experienced three stages of differential cooling: Late Triassic–Early Jurassic(~230–174 Ma), Late Jurassic–Earliest Cretaceous(~174–135 Ma) and later(~135 Ma). The first two cooling stages are well preserved by the detrital AFT thermochronological result(P1, P2) from the adjacent Lower Cretaceous strata, while P3(ca. 105.6 Ma) records coeval volcanic activity. Furthermore, our data uncover that hanging wall samples cooled faster between the Late Triassic and the Early Cretaceous than those from the footwall of Shalazha thrust fault, which synchronizes with the cooling of the Shalazha Mountain and implies significant two-stage thrust fault activation between ca. 230 and 135 Ma. These new low-temperature thermochronological results from the Shalazha Mountain region and nearby reveal three main phases of differential tectonothermal events representing the Mesozoic reactivation of the central segment of the southern CAOB. In our interpretations, the initial rapid uplift in the Late Triassic was possibly associated with intracontinental orogenesis of the CAOB. Subsequent Middle Jurassic–Earliest Cretaceous cooling is highly consistent with the Mesozoic intense intraplate compression that occurred in the southern CAOB, and is interpreted as a record of closure of the Mongol-Okhotsk Ocean. Then widespread Cretaceous denudation and burial in the adjacent fault basin could be linked with the oblique subduction of the Izanagi Plate along the eastern Eurasian Plate, creating a northeast-trending normal fault and synchronous extension. However, our AFT thermochronometry detects no intense Cenozoic reactivation information of Shalazha Mountain region.

Carboniferous slab-retreating subduction of backarc oceans:the final large-scale lateral accretion of the southern Central Asian Orogenic Belt

During Carboniferous time,tremendous juvenile arc crust was formed in the southern Central Asian Orogenic Belt(CAOB),although its origin remains unclear.Herein,we presented zircon U-Pb-Hf and whole-rock geochemical and Sr-Nd isotopic data for a suite of volcanic and pyroclastic rocks from the Khan-Bogd area in southern Mongolia.These Carboniferous pyroclastic rocks generally have some early Paleozoic zircons,probably derived from the granitic and sedimentary rocks of the Lake Zone and the Gobi-Altai Zone to the north,indicative of a continental arc nature.In addition,they have a main zircon U-Pb age of ca.370–330 Ma,positive Hf and Nd isotopes,and mafic-intermediate arc affinity,similar to the coeval arc magmatism.Moreover,the pyroclastic rocks of the northern area have more mafic and older volcanic components with depositional time(ca.350–370 Ma;Visean and Bashkirian stages)earlier than that in the southern area(mainly ca.350–315 Ma;Serpukhovian and Bashkirian stages).Combining a preexisting northward subduction supported by the available magnetotelluric data with a slab rollback model of the main oceanic basin of the Paleo-Asian Ocean(PAO)during Carboniferous and Triassic times,we infer that the Carboniferous arc magmatism was probably derived from a backarc ocean triggered by slab rollback.Thus,the juvenile arc volcanism of Mongolia,together with other areas(e.g.,Junggar)in the southern CAOB,represented a significant lateral accretion that terminated after the Carboniferous due to a significant contraction of the PAO.

松辽盆地中央古隆起带南部基岩储层特征及油气成藏模式

松辽盆地中央古隆起带南部具备良好的油气藏形成条件,是吉林油田油气风险勘探的重要领域之一。笔者综合岩芯、薄片观察,测录井资料分析,孔渗分析和三维地震解释,在大量统计分析和地质研究基础上,探讨了中央古隆起带南部基岩储层特征和油气成藏模式,提出3点认识:①基底岩性主要为花岗岩、花岗闪长岩、闪长岩、片岩、糜棱岩、变质砂岩、安山岩、凝灰岩和灰岩9种,其中花岗岩、花岗闪长岩、安山岩和片岩为成储优势岩性;②基岩主要储集空间为裂缝和溶蚀孔,储层主要发育在基岩顶面风化壳风化淋滤层和裂缝层中;③基岩油气藏可划分为近源缓坡超覆、近源陡坡对接(顺向对接和反向对接)和源内披覆(断阶披覆和背斜披覆)3类成藏模式。该研究明确了中央古隆起带南部基岩油气藏勘探方向,为有利目标区预测提供理论支撑。

喜马拉雅地体的泛非-早古生代造山事件年龄记录

喜马拉雅地体是55±10Ma以来印度陆块与欧亚大陆碰撞而形成的增生地体,位于其中的高喜马拉雅与特提斯-喜马拉雅构造单元的变质基底主要由角闪岩相的富铝变质沉积岩和花岗质片麻岩组成。对两类岩石中锆石的SHRIMPU-Pb测年结果表明,除了记录了20Ma以来的构造事件年龄外,主要保存了529-457Ma的变形和变质事件记录,另外还保存了更早期(>835Ma)的年龄信息。根据20Ma以来崛起的喜马拉雅挤出岩片中包含早期强烈褶皱和向南的斜向逆冲构造以及伴随的角闪岩相变质作用记录,结合岩石测年所获得的大量泛非-早古生代年龄和奥陶纪底砾岩的发现,说明曾位于南半球印度陆块北部的变质基底岩石经历过泛非-早古生代造山事件,同位素年代学数据表明:(1)原始喜马拉雅山是泛非-早古生代造山事件的产物;(2)印度陆块早-中元古代变质基底的再活化在原始喜马拉雅山形成中起重要的作用;(3)现在的喜马拉雅山是在泛非-早古生代造山事件基础上再造山的结果。

藏南特提斯喜马拉雅带中段二叠纪——白垩纪的火山活动(Ⅰ):分布特点及其意义

在野外实地考察和追索的基础上,详细厘定了特提斯喜马拉雅带中段晚古生代以来火山岩的分布特点和迁移规律。结果表明,在特提斯喜马拉雅带中段晚古生代以来的地层系统中,从二叠纪→三叠纪→侏罗纪→白垩纪,共有11个层位含规模不等的火山岩,它们以透镜体、薄夹层或以块状玄武岩、玄武质安山岩等形式产出于不同地层系统中;从二叠纪→早中三叠世→晚三叠世→侏罗纪和白垩纪,具有由西向东、从南→北→南→北的迁移规律。这些火山活动的发现和厘定,对填补特提斯喜马拉雅带火山岩研究的空白,了解陆下岩石圈地幔和软流圈地幔之间的相互作用和新特提斯洋盆的形成演化都具有一定的指示意义。

中天山南缘乌瓦门地区发现蛇绿混杂岩

新发现的乌瓦门蛇绿混杂岩出露于中天山南缘断裂带中,主要表现为以变质粉砂岩为主的基质中混杂着大小不一、性质各异的块体。基质主要为泥盆纪绢云石英片岩、绢云绿泥石英片岩、二云石英片岩、千枚岩和变质粉砂岩,块体有肢解的蛇绿岩岩块、片麻岩岩块和大理岩岩块。肢解蛇绿岩岩块主要有含辉纯橄岩岩块、辉长岩岩块、基性火山岩岩块和硅质岩岩块。

宁夏中南部古生代弧型构造

宁夏中南部地区在中奥陶世至泥盆纪是作为北祁连造山带北侧的弧后前陆盆地靠大陆一侧而存在的;由于在早古生代晚期该前陆盆地的关闭,该地区下古生界变形,发育明显的逆冲推覆构造,形成一个大型的弧形构造,该弧形构造主要由弧形逆冲断层以及相关褶皱所组成,该构造弧顶指向北东,西翼宽、东翼窄,是加里东运动的组成部分,动力方向来自于南南西,即北祁连造山带。而卫宁北山地区的东西向构造仅仅是该弧形构造的一翼。新生代弧形构造是在古弧形构造的基础上形成的,并一定程度上改造了古构造。

柴达木盆地南缘晚奥陶世万宝沟花岗岩：锆石SHRIMP U-Pb年龄、Hf同位素和元素地球化学

柴达木盆地南缘万宝沟花岗岩体主要由似斑状黑云母石英二长岩、环斑结构黑云母二长花岗岩和中粒黑云母二长花岗岩组成,岩体中发育岩浆暗色包体。环斑结构黑云母二长花岗的锆石SHRIMP U-Pb定年为441±5Ma,表明其形成于晚奥陶世。该花岗岩的SiO2含量变化较大(62.20%～75.32%),高钾(3.58%～5.15%)和碱(K2O+Na2O>7%),A/CNK为0.98～1.09,属弱过铝质高钾钙碱性系列;K2O/Na2O(>1)、FeOT/MgO(3.4～6.5)和Ga/Al(2.3～3.1)比值较高,亏损不相容元素Ba、Sr、Nb、P和Ti,相对富集Ta、Hf和Zr,具有A-型花岗岩的特征。黑云母二长花岗岩的εHf(t)=-1.1～10.5,tDM2=744～1490Ma,变化范围较大,表明其物质来源具有多源性,但以壳源为主。较高的εHf(t)(达10)值和较年轻的tDM2(仅为744Ma)暗示,源区中有年轻组分的参与。结合区域地质特征分析,认为该花岗岩形成于后造山的拉张环境。万宝沟花岗岩在结构和地球化学特征上与典型环斑花岗岩有相似之处也有差异,与秦岭中生代环斑结构花岗岩基本相似,表明中央造山带存在古生代和中生代两期环斑结构花岗岩。这将对中央造山带构造演化的进一步研究具有重要的科学意义。

青藏高原内部三条磨拉石带的确定及其构造意义

青藏高原内部自北而南沿羌北－昌都、班公湖－怒江、雅鲁藏布江分别发育了3条磨拉石带。各磨拉石带的长度均超过1000km，宽度一般仅数十km，沉积物具有碎屑性、粗粒性、再旋回性，沉积体厚3000～8000m，具有在挤压造山背景下形成的磨拉石建造的基本特征。各磨拉石带都位于各自的地体缝合带并跨越其两侧的部分地带。北边的为金沙江缝合带及其西延部分，中部的为班公湖－怒江缝合带，南边的为雅鲁藏布江缝合带。3条磨拉石带标志着有3条雄伟的造山带与之毗邻。北边的是可可西里－巴颜喀拉造山带，中部和南部的两条造山带一直不为人们所注意，文中建议分别称之为藏中造山带和藏南造山带。此外，造山作用发生的时间明显滞后于地体缝合的时间，其间有后继的浅海盆地发育。磨拉石带的发育历史勾绘出青藏高原构造演化遵循一个程式，即"地体拼接－后继性盆地发育－造山作用发生－山脉消亡"，这是很有意义的构造现象。

藏南定日地区主中央冲断层与藏南拆离系的特征及其活动时代

低喜马拉雅结晶杂岩构成了北北东向阿伦背斜的核部,该背斜东、西两翼由高喜马拉雅结晶杂岩组成,这两者之间的界线为主中央冲断层(MCT1)。MCT1原为向南逆冲的韧性断层,后遭受北北东向褶皱作用而转变为正断层。高喜马拉雅结晶杂岩顶部被藏南拆离系下部的韧性正断层所截,与其上覆的北坳组分开,北坳组顶部又被一脆性正断层将其与上覆的藏南特提斯沉积岩分开。这条韧性正断层称为STD1,其上部的脆性正断层称为STD2。独居石U-Th-Pb测年结果和构造分析表明,藏南定日地区的高喜马拉雅结晶杂岩就是借助这2条韧性断层MCT1与STD1在大约13Ma时从藏南中下地壳折返至地壳浅部的,然后再遭受近南北向的褶皱作用。

穆龙套-萨瓦亚尔顿-库姆托尔金矿带典型矿床的对比研究

南天山金矿带是世界上一个重要的金矿资源地,产出数个超大型金矿。这些矿床有许多共同点:如大地构造背景、构造环境、含矿岩系、容矿岩石、控矿构造、矿体形态、矿石类型、主要金属矿物、载金矿物、围岩蚀变、成矿时代和成矿方式等相似。但是,进一步分析可以发现他们之间也存在一定差异。例如,在构造位置、物质成分、围岩蚀变等方面存在差异。对本区一些基本的成矿特征进行分析后,认为矿带的形成与南天山造山带的形成和演化关系密切,华力西期与花岗岩活动有关的热液成矿作用应是主要的成矿作用。因此,该矿带应属于细脉浸染型金矿较为合适。南天山尚有寻找此类金矿的远景。

冈底斯驱龙斑岩铜-钼矿区外围矽卡岩型铜矿的分布、特征及深部找矿意义

世界范围内,巨型斑岩型矿床外围通常发育有同时代且具有成因联系的矽卡岩-脉状金属矿床;二者往往互为找矿标志,共同组成斑岩成矿系统。形成于印度-欧亚大陆后碰撞背景,与中新世adakitic质侵入岩有关的冈底斯斑岩Cu-Mo矿床成矿带已成我国重要的矿产基地。位于冈底斯中段的驱龙巨型斑岩Cu-Mo矿床(>1000MtCu)是我国目前最大的铜矿床,在其外围南部及东南部,分布着知不拉、朗姆家果两个矽卡岩型Cu矿;矽卡岩及矿体走向近东西,向北陡倾,矿体深部向驱龙斑岩矿床延伸。成矿时代上,知不拉与驱龙完全一致;同时知不拉与朗姆家果具有极其相似的矿床地质特征、矽卡岩矿物组成和矿化类型,硫化物组合均为黄铜矿、黄铁矿、斑铜矿和辉铜矿;矽卡岩中的石榴石主要是具有韵律生长环带的钙铁榴石(Ca3Fe2Si3O12)为主,少量的钙铝榴石(Ca3Al2Si3O12);从矽卡岩的产状推断二者可能相连成一体。最新的钻探揭示在朗姆家果矽卡岩矿床的深部出现驱龙斑岩矿床中的花岗闪长岩和黑云母二长花岗岩,表明它们是同一期岩浆-成矿作用的产物。在冈底斯带上斑岩型矿床外围有利区域寻找矽卡岩型矿床将极大的拓展找矿思路和空间。

鲁中南泰安纸坊泉域岩溶水强径流带成因及特征

近年来,鲁中南地区岩溶地下水泉水流量衰减、干涸,水源地超采,岩溶塌陷等环境地质问题日益凸显,迫切需要加强研究。以泰安纸坊泉域为例,探讨了泉域内岩溶水强径流带分布、成因类型及典型水文地质特征,以达到合理开发、保护岩溶地下水的可行性。结果表明,岩溶水强径流带是有巨大调蓄功能并发育于浅部地下水积极交替带的网络状强岩溶富水带,其地下水动态稳定,成井率高且识别特征明显,是本区岩溶水水源地开采的理想场所。研究强径流带系统的水文地质条件,掌握其规律,为进一步研究鲁中南地区岩溶地下水提供了一条有效途径。

大兴安岭中南段夕卡岩型铅锌矿床地质特征及成因

大兴安岭地区是中国东部重要的成矿集中区之一。夕卡岩型金属矿床多分布于二叠系大理岩或结晶灰岩夹层内,复背斜轴部的虚脱带和断层交汇处是赋矿的有利场所。白音诺尔和浩布高是近年来发现的两个大型铅锌矿床,均经历了中温、高温两个矿化阶段;矿石铅同位素属于放射性成因铅,暗示其成矿物质以壳源铅为主;硫化物硫同位素均多为较低正值并呈塔式分布,具有岩浆硫特征;与硫化物共生的石英单矿物的氧同位素表明矿床成矿流体具有深部岩浆水与大气降水或地层水混合的特征,矿床应属于与深部隐伏岩体有关的中—高温夕卡岩型铅锌矿床,矿区深部隐伏岩体的侵入产生岩浆热液并携带Pb、Zn等成矿物质与地层水或大气降水混合,受构造作用控制形成的该类型矿床。

松辽盆地中央古隆起带南部酸性侵入岩储层特征与主控因素

通过岩芯观察、薄片鉴定、孔渗分析和测井解释等方法,对松辽盆地中央古隆起带南部基底酸性侵入岩类储层特征及优质储层主控因素进行研究。结果表明,松辽盆地中央古隆起带南部基底酸性侵入岩主要为花岗闪长岩(富铝)与二长花岗岩,储集空间以裂缝和溶蚀孔为主,平均孔隙度为3.46%,平均渗透率为0.52×10^(-3)μm^(2)。优质储层主控因素包括岩性、矿物组合与风化壳结构发育特征,基底岩性及矿物组成是松辽盆地基岩优质储层发育的内在因素,风化淋滤作用对基岩储层的改造是外在因素。基底储层的风化壳结构分为3层,风化淋滤带为最有利的储集部位,裂缝发育带储层非均质性较强,风化堆积层与内幕段没有储集能力。