峨山玉河寨杂岩体的反序岩浆演化及成因探讨

玉河寨基性－超基性环状杂岩体的岩相学及地球化学资料表明，属同源岩浆演经的产物，岩浆演化为基性→超基性的反序岩浆演化。这种反序岩浆演化的机制主要是由于斜长石在高位岩浆房中的分离结晶所致。对流分离作用可能是斜长石晶体从熔融体中分离的方式。在此基础上，笔者提出了该岩体的成因模式。     

攀西裂谷构造─岩浆活动及其成因探讨

本文主要讨论弯窿一火山型攀西裂谷的成因，岩浆深成作用与火山作用过程;弩窿梅 造的发生、发展的演化历史，岩浆分异趋势及双峰式岩浆演化系列及其成因。 攀西裂谷曾经历了岩石圈弯窿一除壳弯窿一次火山弯窿三个发展演化阶段。碱性岩浆作用与 地壳隆开、地慢去气、热流汇聚作用有着密切的成因联系，成弯作用最盛，岩浆碱度最高。随着 陆壳破裂、开放、挥发分散逸，岩浆性质从强碱质一弱碱质一碱酸性转化。 弯窿构造的发展演化阶段有机地控制了岩浆源和二次岩浆房的深度和岩浆演化特点，随着弯 窿构造的发展演化，岩浆活动由深成慢源→中浅成慢源加嵌轻微混染→超浅成壳慢混合源逐渐 演化，因而可以认为:弯窿一火山型裂谷发育的各个阶段，存在有低位→中位→高位的二次岩浆 房. 攀西裂谷属不发育的夭折裂谷，以演化时间长为特点，有利于岩浆深源(二次岩浆房内)结 晶分异、液体不混容性分离作用和陆壳的同化混染作用等得以彻底进行，最终形成“双峰式”岩 浆组合。     

花岗岩类填图方法评述与建议

花岗岩类的分类理论决定其填图方法，现行的单元-超单元填图方法是依据花岗岩类的I型、S型分类理论和同源岩浆演化理论而建立的，由于同源岩浆演化理论的不完善性、地质作用过程的多样性，导致了形成花岗岩类源岩组分的复杂性，使得I型、S型分类的不确定性，因而单元-超单元填图方法在实践中存在较多问题和矛盾，笔建议的花岗岩类填图办法是，以基本岩石分类方案为依据，以野外可识别、易掌握的客观岩石学、矿物学、组构学为准则，客观、真实的反映花岗岩类的地质特征。     

琼南九所—高峰地区花岗岩谱系单位及演化特征

根据同源岩浆演化的理论，运用单元一超单元的填图方法，将琼南九所－高峰地区的花岗岩分成９０个侵入体，建立１８个单元，归并为４个超单元，建立了该地区花岗岩的谱系单位，并对其岩石类型，岩石化学的演化特征进行了探讨。     

赣东北晚元古代港边岩浆混合杂岩体的区域地质调查及岩石学研究

赣东北横峰县港边岩体是我国罕见的填图尺度上表示的岩浆混合杂岩体。该杂岩体出露于古江南造山带的南侧，实际上它是该造山带晚元古代增生柱内岩浆混合作用的典型产物。文章从地质学、岩相学和岩石地球化学等不同角度确证港边岩浆混合杂岩体形成于开放体系下岩浆演化的独特方式－－岩浆混合作用。因此，我们在填图时没有采用封闭体系下岩浆演化的谱系单元－超单元方法，而是以岩浆混合作用理论为基础，应用端员－混合物－端员的区域地质测量方法对港边岩浆混合杂岩体进行了有效的分解和研究。     

对岩浆过程的进一步解析

对于岩浆作用来说,岩石地球化学方法更多地用来探讨岩浆的起源、不同岩浆的相互混合、围岩对岩浆的混染及岩浆自身的演化和团结等。实验岩石学与岩相学研究相结合至今已构成了基本的岩石学理论框架,近些年来的工作一般是为不多见的岩石学现象、难以解决的岩理学问题及有关的岩浆过程进行更加深化和补充的实验。岩浆动力学利用流体力学的方法定量描述岩浆过程,建立理论模型。本文从这三方面简要叙述新近对岩浆过程分析研究的某些进展。     

造山带异源浆混花岗岩理论与方法研究

1：5万花岗岩填图方法在区调工作中推广以来,在造山带花岗岩调查实践中,由于造山作用及过程的复杂性,花岗岩浆的多源及多样性,使同源岩浆演化理论及方法遇到了难题。文章在新一轮1：25万造山带试点图幅,在对同源岩浆演化理论及方法的适用性进行探索的同时,提出了异源浆混理论指导造山带内部浆混花岗岩（H型花岗岩）的填图方法。并就异源浆混花岗岩鉴别标志等作了系统总结,提出了浆混组合、浆混单元、浆混体,填图的理论方法体系;给予了浆混花岗岩明确的定义。     

花岗质岩浆能够结晶分离和演化吗？

学术界普遍认为花岗岩能够分离和演化,实际上这是不对的,理由是没有野外和镜下观察的证据。岩浆演化的理论是对的,该理论是从研究玄武质岩浆得来的,只适合玄武质岩浆而不适合花岗质岩浆。本文指出,鲍温反应原理不适用于花岗质岩浆。文中呼吁要重视区分幔源岩浆和壳源岩浆,幔源岩浆可以演化,但是,幔源岩浆不可能演化为壳源岩浆,壳源岩浆不可能演化。     

四川米仓山地区晋宁期中性侵入岩序列岩石地球化学特征及其演化

本文首次以同源岩浆演化等级体制单元、超单元研究法对四川南江米仓山地区中性侵入岩———寨坡超单元进行了有效解体和系统研究。寨坡超单元是一以石英闪长岩为主体的超单元，由５个侵入岩单元组成，具有明显的结构－成分演化特征。各单元岩石均为ＳｉＯ２过饱和的正常岩石类型，δ＝１．９～３．３，具钙碱系列岩浆演化趋势。稀土元素为具弱负铕异常的轻稀土富集型；微量元素指示岩浆遭受了一定的混染作用。本超单元岩石同位素年龄为９４２～８７０Ｍａ，为晋宁期末岩浆活动的产物，具明显Ⅰ型岩浆同源演化的特征。     

四川峨边群冷竹坪组和枷担桥组火山岩的地质地球化学特征及岩浆演化

本文在前人研究的基础上，重点讨论了峨边群下部冷竹坪组和枷担桥组火山岩的地质地球化学特征及演化规律，经研究认为，其岩石化学成分属拉斑玄武岩系列；微量元素组合不协调；主要岩元素和微量元素具有同源演化关系；分异作用是岩浆演化的主导因素，且分离结晶的矿物相为斜长石。     

Basites of the polychronous magmatic center with the Erdenetiyn-Ovoo porphyry Cu-Mo deposit (northern Mongolia): petrogeochemistry, 40Ar/39Ar geochronology,geodynamic position,and related ore formation

The Erdenetiyn-Ovoo magmatic center (EMC) with a porphyry Cu-Mo deposit includes the following intrusive complexes: Selenga, Shivota, ore-bearing porphyry, and post-ore dike. The EMC formed at 260–200 Ma. The geologic evolution of northern Mongolia in that period was much determined by the effect of a mantle plume, which showed two periods of activity: Late Paleozoic and Early Mesozoic. The long multistage evolution of the EMC was due to its localization on the periphery of the Late Paleozoic and Early Mesozoic areas of the plume’s influence. The Shivota and post-ore basites are considered to be comagmatic to the Late Permian–Early Triassic trachyandesite-basalt and Late Triassic–Early Jurassic trachyandesite series, respectively, which are similar to the products of Late Paleozoic and Early Mesozoic within-plate magmatism in northern Mongolia. The Selenga complex, which formed before the Shivota one, and the porphyry complex, which formed before the post-ore dike one, are differentiated gabbro-granite series. Gabbro-granitoid magmatism was initiated by the melting of rocks of continental lithosphere under the action of a plume. Later on, as the plume ascended to the surface and the lithosphere became thinner, the conditions were created favoring the lithosphere breakthrough and within-plate basaltoid magmatism.In geochemical features (high contents of LILE and LREE, low contents of HFSE and HREE) the studied basites are similar to the products of subduction magmatism. But this contradicts the geologic position of basites formed after the completion of subduction during the transition of the region to the rifting stage and during the rifting. The mantle metasomatized during the preceding subduction is regarded as the main source of basites. The high contents of alkalies and LREE in the volcanics of the post-ore dike complex and the REE patterns similar to the OIB ones evidence the influence of the plume on the magma formation. The high contents of incompatible trace elements and the Nd isotope composition corresponding to the weakly depleted mantle do not exclude a possible plume effect during the formation of the Selenga complex gabbroids. The geochemical features of the Shivota gabbros, comagmatic to volcanics produced during the Late Paleozoic within-plate activity, are partly transformed during the melt evolution in crustal chambers.The REE patterns of the EMC basites evidence that the evolution of ascending magma was accompanied by the fractionation of amphibole. During this process, ore elements were redistributed into mineral and concentrated in amphibole-containing rocks, from which metals were later mobilized by late melts and fluids. The evolution of basaltoid magmatism of the Selenga, Shivota, and porphyry complexes is regarded as a preliminary stage of ore formation, which was considerably responsible for the EMC productivity.     

关于造山带花岗岩类填图方法的讨论——以西秦岭天水地区为例

花岗岩类的分类理论决定其填图方法。现行的单元－超单元填图方法是依据花岗岩类的Ⅰ型、S型分类理论和同源岩浆演化理论而建立的。由于同源岩浆演化理论的不完善性，造山带地壳结构及地质结构特征的复杂性、地质作用过程的多样性，导致了形成花岗岩类源岩组分的复杂性，使得Ⅰ型、S型分类在造山带具有不确定性，因而单元－超单元填图方法在造山带实践中存在较多问题和矛盾。造山带花岗岩类填图方法应以基本岩石分类方案为依据，以野外可识别、易掌握的客观岩石学、矿物学、组构学为准则，客观、真实地反映造山带花岗岩类的特色。     

浙江景宁花岗岩基的解体划分及其演化

根据同源岩浆演化的观点,运用岩石谱系单位的划分方法,将景宁花岗岩基解体,划分为９个单元,归并成２个超单元。岩体定位方式为断裂扩张型。     

Intraplate basic-ultrabasic magmatism through time in terms of supercontinental cyclicity

In this work the available worldwide data on intraplate basic-ultrabasic magmatism are reviewed. It was established that over the past 3500 Ma in the Earth’s geological history the process of intraplate magmatism occurred episodically with relatively short breaks with no evident periodicity in its development. Due to the similar discrete character of intraplate magmatism there is no direct correlation between this magmatism and a definite stage of the supercontinental cycle. The evolution of supercontinents at all stages of their development was accompanied by basic-ultrabasic magmatism.     

能量地球化学在花岗岩岩石谱系单位建立中的初步应用

岩浆的侵位和演化过程不仅仅表现为物质上的演化趋势 ,而且也是能量的释放和转移过程。以海洋山花岗岩体为例 ,通过对岩体岩石能量的计算 ,初步探讨了岩石能量地球化学在花岗岩体岩石谱系单位建立中的应用 ,并通过圆石山岩体和栗木岩体对该方法进行了验证。在同源岩浆演化的条件下 ,无论岩石结构是由粗粒到细粒或者是由细粒到粗粒演化 ,岩石的能量从早期侵位单元到晚期侵位单元是逐渐增大的。     

东天山香山铜镍-钛铁成矿与两类岩浆演化关系探讨

香山矿床是东天山唯一一个铜镍矿体与钛铁矿体共存的复合型矿床,目前普遍被认为是同源岩浆高度演化的产物。但为何区内众多同时代镁铁-超镁铁质岩体中只有香山岩体产出有大型钛铁矿床?这一问题仍有待进一步探讨。本文通过系统对比香山与其相邻的黄山东、黄山和黄山南等典型铜镍矿的地球化学特征、母岩浆性质及岩浆演化过程,认为香山岩体母岩浆相对其相邻典型铜镍矿床并不富集Fe和Ti,且其母岩浆早期演化过程及分异演化程度相似。模拟计算表明:岩浆体系早期都处于较还原的环境(f_(O_2)QFM+1),而且都发生了大量橄榄石、斜方辉石和单斜辉石的分离结晶和硫化物的熔离,由此消耗了岩浆体系中大量的Fe,导致残余岩浆中Fe含量降低;另外在岩浆演化的各阶段,尤其到岩浆演化后期,大量角闪石的结晶进一步降低了残余岩浆中的Fe和Ti的含量,不能造成Fe和Ti的逐渐富集,据此我们认为同源岩浆演化不具备形成钛铁矿床的物质基础。通过初步对比东天山地区典型铜镍矿床和钛铁矿床与该地区早二叠世两类玄武岩的地球化学特征及演化趋势,我们初步推测东天山地区铜镍成矿与钛铁成矿是两类不同性质岩浆独立演化的产物,铜镍成矿可能与拉斑玄武质岩浆演化密切相关,而钛铁矿则可能与碱性玄武岩演化密切相关。     

Geochronological constraints on the emplacement history of an anorthosite — rapakivi granite suite: U−Pb zircon and baddeleyite study of the Korosten complex,Ukraine

U–Pb zircon/baddeleyite ages obtained for the Korosten anorthosite-rapakivi granite complex, Ukrainian shield, suggest that different magmatic phases were emplaced during a period of ca. 30 million years as a series of distinct igneous episodes. The earliest 1789.1±2.0 Ma anorthosites were followed by 1781.3±3.2 Ma dykes of plagiogranite porphyries. The emplacement of a major rapakivi granite phase took place at 1767.4±2.2 Ma, and was followed by emplacement of layered intrusions of anorthosites, gabbronorites, diabases and ultrabasic rocks between 1761 and 1758 Ma. The minimum duration of magmatism of about 30 million years, the 6–15 million years interval between igneous pulses, and alternation of discrete episodes of basic and felsie magmatism are common features of major anorthositemangerite-charnockite-rapakivi granite complexes. Temporal distribution of igneous activity in the Korosten complex shows that the gabbro-anorthosites and the granites are not comagmatic, although they are possibly cogenetic, and that at least four portions of granitic and basic magmas were generated during a relatively long period of at least 30 million years. The time gap of about 20–25 million years between early basic and later and more voluminous granitic magmatism, characteristic of the Korosten pluton, Wiborg and Salmi batholiths, probably reflects the duration of extensional processes before the generation of large volumes of magma in the lower crust.     

Geodynamic settings and history of the Paleozoic intrusive magmatism of the central and southern Urals: Results of zircon dating

The main stages of the Paleozoic intrusive magmatism in the Urals, 460–420, 415–395, 365–355, 345–330, 320–315, and 290–250 Ma, as well as two virtually amagmatic periods, 375–365 Ma (Frasnian-early Famennian) and 315–300 Ma (Late Carboniferous), are recognized. The Cambrian-Early Ordovician pause predated the onset of igneous activity in the Ural Orogen, while the Early Triassic pause followed by an outburst of trap magmatism postdated this activity. The interval from 460 to 420 Ma is characterized by mantle magma sources that produced ultramafic and mafic primary melts. The dunite-clinopyroxenite-gabbro association of the Platinum Belt and miaskite-carbonatite association are specific derivatives of these melts. The rift-related (?) Tagil Synform functioned at that time. The volcanic-plutonic magmatism in this oldest magmatic zone of the Uralides comprises gabbro, gabbro-granitoid, and gabbro-syenite series and comagmatic volcanic rocks. After a break almost 20 Ma long, this magmatism ended in the Early Devonian (405–400 Ma) with the formation of small K-Na gabbro-granitoid plutons. The magmatic intervals of 415–395, 365–355, and 320–315 Ma are characterized by the mantle-crustal nature. The first interval accompanied obduction of the oceanic lithosphere on the continental crust. The subsequent magmatic episodes presumably were related to the subduction of the island-arc (?) lithosphere beneath the continent and to the collision. The intense granitoid magmatism started 365–355 Ma ago. As in the following interval 320–315 Ma, the tonalite-granodiorite complexes, accompanied by hydrous basic magmatism, were formed. Amphibole gabbro and diorite served as a source of heat and material for the predominant tonalite and granodiorite. The Permian granitic magmatism had crustal sources. Thus, the mantle-derived Ordovician-Middle Devonian magmatism gave way to the mantle-crustal Late Devonian-Early Carboniferous plutonic complexes, while the latter were followed by the crustal Permian granites. This sequence was disturbed by rifting and formation of continental arcs accompanied by specific Early Carboniferous Magnitogorsk gabbro-granitoid series and Early Permian Stepnoe monzodiorite-granite series, which deviate from the general evolutional trend.     

High-precision geochronology of Mesozoic magmatism in Macao,Southeast China:Evidence for multistage granite emplacement

Six new high precision U-Pb zircon ID-TIMS ages plus thirteen in situ high spatial resolution U-Pb zircon LA-MC-ICPMS ages are reported from Jurassic plutonic(metaluminous to weakly peraluminous biotite granites)and Jurassic to Cretaceous hypabyssal(dacites)rocks from Macao.Despite its relatively small area(~30 km^2),the new ages tightly constrain the Macao granitic magmatism to two periods ranging from 164.5±0.6 Ma to 162.9±0.7 Ma and 156.6±0.2 Ma to 155.5±0.8 Ma,separated by ca.6 Ma.Inherited zircons point to the existence of a basement with ages up to Paleo-Proterozoic and late Archean in the region.In addition,younger dacitic rocks were dated at 150.6±0.6 Ma and<120 Ma.U-Pb zircon ages and whole-rock REE data of Macao granites indicate that the first pulse is also represented in Hong Kong and Southeast(SE)China,while magmatism with the chemical characteristics of the second pulse seems to not be represented outside Macao.The two granitic magmatic pulses have distinct mineralogical and geochemical features that support their discrete nature rather than a continuum of comagmatic activity and suggest that the Macao granitic suite was incrementally assembled during a period of ca.9 Ma,a hypothesis also extendable to the neighboring Hong Kong region for a time lapse of ca.24 Ma.In Macao,the transition from granitic magmatism(Middle to Upper Jurassic)to the younger dacite dykes(Upper Jurassic to Lower Cretaceous)most likely corresponds to a change in the regional tectonic setting,from an extensional regime related with foundering of the subducting paleoPacific plate during the Early Yanshanian period to the reestablishment of a normal subduction system in SE China during the Late Yanshanian period.