Control of subduction rate on Tonga-Kermadec arc magmatism

Dehydration/melting of oceanic crusts during returning to the mantle in subduction zones are related to origin of arc lavas. The factors that influence arc magmatism include compositions of the subducting slabs, mantle wedge and subduction rates. However, distinguishing these factors remains difficult and highly debated. Subducting rate is related to the total mass of inputs and controls thermal structure, thus plays a crucial role in arc magmatism. Here we explore the relationships between geochemical variations of arc lavas and convergence rates(increasing from 46 mm/a to the south to 83 mm/a to the northward) in the Tonga-Kermadec arc system. Data of geochemistry for lava samples from nine islands of this arc system are collected and compiled to investigate the role of subduction rate in arc magmatism. Lavas from the northern Tonga arc with a faster subduction rate show broadly lower concentrations of TiO_2 and highfield-strength elements(HFSEs, e.g. Nb, Ta, Zr, Hf), and higher Ba/Th, U/Th ratios than the Kermadec Arc to the south. Some of the Kermadec lavas show the highest values of Th/Nb ratio. We suggest that the northern Tonga arc with a higher subduction rate has been influenced by a stronger role of subductionreleased fluid, which results in stronger large-ion-lithophile elements(LILEs) and relatively weaker HFSEs contribution. It is interpreted that faster subduction rate tend to create a cooler subduction zone, leading to stronger dehydration subduction slab contribution with, thus, higher LILE/HFSE ratios of arc lavas. The conclusion contributes to a better understanding of arc magmatism, and ultimately the long-term chemical differentiation of the Earth. More supplementary geochemical data along Tonga-Kermadec arc and tests in other arcs are needed.     

Taimyr Peninsula （ Arctic tectonic thrust sheets Siberia） in Late Precambrian： and geodynamic evolution

Structural relationships between the Neoproterozoic rock complexes of a continental massif, island arc and back-arc basin geodynamic affinities are described and considered in this work based on field observations within the northeastern segment of the Central Taimyr tectonic zone distinguished in the late Hercynian fold- thrust belt of Taimyr Peninsula. As is established for the first time, rock complexes of the continental massif with the early Late Riphean （Tonian-Cryogenian） volcanogenic-sedimentary cover occur in the study region as the allochthonous syn- and post-sedimentary thrust sheets buried in or thrust over deposits of a back-arc basin, which accumulated in the terminal Late Riphean （Cryogcnian）-initial Vendian （Ediacaran）. These and other results of the large-scale structural observations elucidate important details of the region tectonic development in the Late Precambrian, when two lateral ensembles of the Neoproterozoic structures originated in the region. In the first half of the Neoproterozoic, the regional tectonic ensemble included the oceanic plate abut on the continental massif with a primitive volcano-plutonic belt. The subsequent system of an island arc and marginal back- arc basin originated in the second half of the Neoproterozoic and existed approximately till the mid-Vendian （Ediacaran） phase of the intense formation of thrust sheets in the region.     

Taimyr Peninsula( Arctic Siberia) in Late Precambrian:tectonic thrust sheets and geodynamic evolution

Structural relationships between the Neoproterozoic rock complexes of a continental massif,island arc and back-arc basin geodynamic affinities are described and considered in this work based on field observations within the northeastern segment of the Central Taimyr tectonic zone distinguished in the late Hercynian foldthrust belt of Taimyr Peninsula. As is established for the first time,rock complexes of the continental massif with the early Late Riphean( Tonian-Cryogenian) volcanogenic-sedimentary cover occur in the study region as the allochthonous syn- and post-sedimentary thrust sheets buried in or thrust over deposits of a back-arc basin,which accumulated in the terminal Late Riphean( Cryogenian)--initial Vendian( Ediacaran). These and other results of the large-scale structural observations elucidate important details of the region tectonic development in the Late Precambrian,when two lateral ensembles of the Neoproterozoic structures originated in the region. In the first half of the Neoproterozoic,the regional tectonic ensemble included the oceanic plate abut on the continental massif with a primitive volcano-plutonic belt. The subsequent system of an island arc and marginal backarc basin originated in the second half of the Neoproterozoic and existed approximately till the mid-Vendian( Ediacaran) phase of the intense formation of thrust sheets in the region.     

西藏阿里仲巴地块公珠错片麻岩锆石U-Pb年代学及其地质意义

仲巴地块是藏南雅鲁藏布江缝合带西段的重要构造单元,对于研究冈瓦纳大陆北缘微地块的构造属性与古地理重建具有重要意义。目前,对于该地块内部是否存在陆块基底尚未有统一认识。通过野外观测、岩石地球化学和锆石U-Pb年代学分析,本研究在仲巴地块中段公珠错南地区识别出一套黑云斜长片麻岩,其w(SiO₂)为64.09%～69.87%,w(Al₂O₃)为12.18%～18.30%,w(TiO₂)为0.55%～0.79%,w(K₂O)为2.53%～3.54%,LREE相对富集,轻重稀土分馏明显,推测其原岩以长石砂岩为主,形成于活动大陆边缘环境。锆石U-Pb年代学分析结果显示,其继承核年龄峰值为2 500,1 600,950 Ma,最年轻的谐和年龄为630 Ma。此外,还获得变质锆石的加权平均年龄为550 Ma。根据上述结果,研究认为公珠错片麻岩形成于新元古代晚期(630～550 Ma),其变形-变质程度较高,能够代表仲巴地块的陆块基底,并进一步证明仲巴地块是印度大陆北缘的组成部分。由此,本次研究...     

湘东北冷家溪群沉积岩地球化学特征及其构造意义

冷家溪群是江南造山带湖南段的最早物质纪录，其沉积构造背景及相关的钦杭结合带位置尚存争议。在野外地质调查基础上，对湘东北金井地区冷家溪群早期-中期相对新鲜砂岩采样进行系统的主量元素和微量元素含量分析，进而按时代先后对砂岩分组并进行地球化学研究，以此探讨沉积期盆地性质及大地构造格局。金井地区冷家溪群砂岩的主量元素组成变化较大，SiO₂质量分数总体较低、Al₂O₃质量分数和Al₂O₃/SiO₂比值较高、K₂O/Na₂O比值高且变化大。轻稀土富集、重稀土平坦、铕负异常明显等特征暨球粒陨石标准化曲线形态与典型的后太古宙页岩和上陆壳相似。主量元素地球化学特征反映沉积环境为弧后盆地，且早期易家桥组和潘家冲组的成熟度较高，主要来源于北邻构造相对稳定的扬子陆块南缘；中期雷神庙组-黄浒洞组的成熟度较低，可能更多来源于南邻构造相对活动的大陆岛弧。各组地层构造环境微量元素判别图解均显示为大陆岛弧环境，但从微量元素特征对母岩的继承性分析，仍反映出弧后盆地环境；有关微量元素参数的相对大小指示早期沉积环境为活动陆缘、中期沉积环境为大陆岛弧，与主量元素特征反映的信息一致。根据上述地球化学证据，提出冷家溪期构造格局与演化过程:早期受古华南洋板块向北西高角度俯冲影响，弧后软流圈上涌导致岩石圈伸展而形成宽阔的弧后盆地，金井地区处于盆地北部而主要接受北邻扬子陆块来源沉积；中期古华南洋板块俯冲角度变缓并推动大陆岛弧向北西运移，弧后盆地收缩，金井地区因构造迁移而主要接受南邻大陆岛弧来源沉积。结合区域资料，认为弧后盆地南邻大陆岛弧大体在安仁-双牌一线。      

柴达木盆地及其邻区早—中二叠世构造岩相古地理格局

通过大量野外观察、分析测试和综合研究,结合覆盖全区不同比例尺的区域地质调查资料,对柴达木盆地及其邻区早—中二叠世构造岩相古地理格局进行了研究,并探讨了其形成机制.结果表明:柴达木盆地及其邻区中、北部早—中二叠世为陆内盆山裂谷系统,主体处于伸展构造背景,总体表现为堑垒相间的构造古地理格局;南部为巴颜喀拉洋盆,早—中二叠世是巴颜喀拉洋盆扩张最为剧烈且规模最大的时期,巴颜喀拉洋盆中洋岛、海山遍布;早—中二叠世晚期强烈的华力西构造运动使古板块间的相对运动加剧,巴颜喀拉洋盆大洋岩石圈板块向北强烈俯冲,形成东昆仑陆缘岩浆弧及其南部增生带,东昆仑陆缘岩浆弧岩浆活动十分强烈,宗务隆山—西秦岭陆源裂谷盆地进一步发育,形成十分复杂的构造岩相古地理格局.早—中二叠世是研究区地球动力学机制从强烈扩张到强烈汇聚的转折时期,加强其构造岩相古地理研究对建立该区地层序列、探讨其地质演化历史以及指导找矿等均具有重要意义.     

Distribution and origin of sediments on the northern Sunda Shelf, South China Sea

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西天山温泉布拉格达瓦一带托斯库尔他乌组沉积特征及构造环境分析

西天山温泉地区广泛发育泥盆—石炭纪火山—沉积地层,布拉格达瓦一带出露的托斯库尔他乌组发育一套由滨海间夹陆相—滨浅海相—浅海相过渡的碎屑岩夹火山碎屑岩的沉积建造,沉积物源主要为中酸性火山岩,碎屑颗粒沉积速度较快,属于近源沉积,蚀源区构造环境具活动性质,形成于未切割的活动岛弧。火山岩呈夹层、透镜体状分布于托斯库尔他乌组地层中,火山作用具周期性间歇喷发的特征,岩相表现为爆发—喷溢—沉积—爆发—沉积—爆发的周期性特点。火山岩属钙碱性岩石系列,火山岩浆对应的俯冲深度为上地幔。火山岩微量元素Nb,Sr,P,Ti,Ba为亏损型,Th,Zr元素富集,与岛弧环境密切相关;Nb/Ta为11.96~15.19,略低于原始地幔值,Zr/Hf为30.17~38.20,与原始地幔值相近。稀土总量∑REE为(186.57~208.58)×10^-6,轻重稀土比值为5.38~6.13;(Ce/Yb)_N为3.90~4.48,(La/Yb)_N为4.67~6.70,δEu为0.28~0.49,属于轻稀土富集型,显示为负铕异常。根据沉积物源区分析及主、微量元素特征,结合区域构造背景,认为晚泥盆世托斯库尔他乌组沉积建造所反映的构造环境为消减带俯冲碰撞的岛弧环境。     

基于磁异常信息的鄂东北四方山地区沉积变质型锰矿找矿预测

为系统开展鄂东北地区锰矿找矿预测, 以四方山地区典型沉积变质型锰矿床为重点解剖对象, 结合高精度磁法测量异常信息, 查明磁异常与锰矿床(体)的空间对应关系。四方山地区锰矿床主要以层状或似层状赋存于新元古代红安岩群黄麦岭岩组(Pt₃h)中, 含锰岩系为一套含火山物质、泥质、粉砂质碎屑沉积岩夹碳酸盐岩, 属于陆源碎屑-碳酸盐岩系。含锰岩系因含少量磁铁矿等铁氧化物而多与1∶5万磁法测量中高强度磁异常套合, 但也有部分位于正负磁异常梯度带上。1∶5万磁法总梯度模量中锰矿化富集地段往往与中-低值区(尤其是线性梯度带)对应。基于矿床地质特征、磁法测量资料的二次开发及野外调查成果, 在四方山地区圈定了四个找矿靶区。其中四方山矿区北侧找矿靶区Ⅰ经TC160揭露一层锰矿体, 厚度2.53 m, Mn平均品位为14.63%;四方山矿区内找矿靶区Ⅱ北段经探槽TC140揭露两层锰矿体, 第一层厚1.63 m, Mn平均品位达24.57%;第二层厚0.98 m, Mn品位为16.73%;南段经探槽TC114揭露一层锰矿体, 厚度1.32 m, Mn平均品位为17.60%。团山沟矿区东南部找矿靶区Ⅳ经地质路线调查也发现了锰矿化体, 显示具有良好的找矿前景。      

Sedimentary response to volcanic activity in the Okinawa Trough since the last deglaciation

To investigate the relationship between volcanic activity and sediment record on regional and temporal scales, 158 surface sediment samples were collected from the East China Sea Shelf to the northern Okinawa Trough (OT), and two cores recovered in the northern and southern OT, respectively. Mineralogy, grain-size, and geochemical analyses of those samples show that: 1) volcanic glass, volcanic-type pyroxene, hypersthenes, and magnetite increase in sediment influenced by volcanic activity; 2) sediment grain sizes (and also silt content) increase in ash layers; and 3) the contents of Na₂O and Zr are higher, while terrigenous elements, e.g., TFe₂O₃ and K₂O, and biogenous compositions, e.g., CaO and Sr, are relatively lower in ash layers than those of non-ash layers. The distribution of volcanic ash has three distinguishing characteristics: 1) volcanic ash is more abundant in the northern and central OT than the southern OT; 2) volcanic ash increases from continental shelf to the trough; 3) the sediment during the last 12 000 a suggests stronger volcanic events than during 15 000–12 000 a. The eruptive locations, frequency, and volume of calderas are among the most important factors controlling the distributions of volcanic ash. In addition, the main Kuroshio warm current that extends northward probably impeded the diffusion of volcanic ash to the west and south in the OT. However, a southward current probably carried some volcanic ash toward southern OT.     

Geochronology of mineralization and tectonic setting of Baishidong skarn-type iron deposit in Helong area of Yanbian,Jilin Province,NE China

The Baishidong iron deposit is the only skarn-type iron deposit discovered in the study area. According to mineral assemblage and paragenesis, the mineralization can be divided into four metallogenic stages: early garnet-diopside skarn stage, late magnetite-tremolite-epidote skarn stage, early quartz-pyrite-chalcopyrite stage and late quartz-calcite-pyrite stage. Through LA-ICP-MS zircon U-Pb dating of diorite, which is closely related to mineralization, the results show that the weighted average age is 164.6±1.4 Ma, which limits the mineralization time of Baishidong iron deposit during or slightly later than Middle Jurassic. The diorite rocks are rich in sodium(Na_2O/K_2O=1.24--1.76), aluminium(Al_2O_3=17.41%--18.76%), LREE and large-ion lithophile elements(Ba, K and Sr), depleted in HREE and high-field-strength elements(Y, Nb, Ta, P and Ti), and show strongly fractionated patterns(LREE/HREE=6.58--9.93), no apparent Eu anomalies(δEu=0.91--1.13), which shows similar characteristics to island arc or active continental margin arc magma. The zircon εHf(t) values range from-22.6 to 5.9, and the age of the two-stage model(t_(DM2)) is 836--2 633 Ma. Above data combined with the geochemical characteristics, it is indicated that the magma was a mixture of multiple sources, composed of ancient materials and newly formed crust. During the process of evolution and ascending of magma, separation and crystallization occurred, and a large amount of continental crust material was mixed at the same time. Combined with regional tectonic evolution, the formation of this deposit may be related to the westward subduction of the Paleo-Pacific Plate to the Eurasian Plate.     

Zircon U-Pb geochronology and geochemistry of diorite dikes from Nancha ore deposit in Tonghua area of Jilin and its geological significance

The authors presented geochronology and geochemical data of diorites from Nancha gold deposit in Tonghua region,with the aim to constraining its formation age,magma source and tectonic setting.LA-ICP-MS U-Pb dating results of zircons from the diorites indicate that the rocks were formed in the Middle Jurassic( 171± 2 Ma,MSWD = 1.19).Geochemically,these rocks have Si O_2 concentrations of 52.52%--54.90%,K_2 O of2.14%--3.84%,Na_2 O of 3.17%--3.35%,Mg O of 7.43%--9.34% and high Mg~# of 68.57-72.57.These rocks are characterized by enrichment in large ion lithophile elements( LILE,such as K,Ba,Rb and Sr) and light rare earth elements( LREE),relatively depletion in high field strength elements( HFSE,such as Ta,Nb,Ti and Zr),and heavy rare earth elements( HREE).These characteristics suggest that primary magma of the rocks were derived from the partial melting of mantle with miner crustal contamination,which may related to partial melting of mantle wedge by addition of sediment melt from subducting oceanic crust.Based on former and present studies,the authors consider that the Nancha ore deposit high-Mg diorites were formed in compressional structural setting which is similar to volcanic arc.It could be related to the subduction of the Paleo-Pacific plate beneath the Eurasian continent.     

Magnetic susceptibility variations of the Ediacaran cap carbonates in the Yangtze platform and their implications for paleoclimate

Magnetic susceptibility (MS) data were obtained from 11 sections of the Doushantuo (Ediacaran) cap carbonate that directly overlies the Nantuo glacial diamictite in the southeastern margin of the Yangtze platform. The MS data revealed two regionally correlatable peaks at the bottom and top of the cap carbonate, separated by an interval of low values. The lower MS peak coincides with high percentage of insoluble siliciclastic residues that are compositionally identical to the matrix of the underlying diamictite, suggesting its origin controlled mainly by detrital components during the first phase of cap carbonate deposition at the end of the glaciation. The upper MS peak is associated with high clay content and iron sulfides, and can be interpreted as either derived from enhanced greenhouse weathering that could have brought more terrigenous components into the ocean, or the result of ocean anoxia at the late stage of cap carbonate deposition that could led to formation of abundant iron sulfides. The regionally consistent MS curves from the cap carbonates provided the first geophysical record for the rapid climate change from icehouse to greenhouse conditions in the aftermath of the Neoproterozoic “snowball Earth” event.     

中亚成矿域Erdenet斑岩型铜钼矿床和Oyu Tolgoi斑岩型铜金矿床对比

中亚成矿域位于北侧西伯利亚克拉通、南侧华北—塔里木克拉通及西侧东欧克拉通之间,与环太平洋成矿域和特提斯成矿域并称为全球三大成矿域,发育有一系列大型—超大型斑岩型铜金、斑岩型铜(金、钼)及斑岩型铜钼矿床.对比研究了中亚成矿域两个典型斑岩型矿床——Er-denet斑岩型铜钼矿床与Oyu Tolgoi斑岩型铜金矿床的矿床地质...     

伊犁地块北缘别珍套山中泥盆统汗吉尕组物源特征及其地质意义

天山造山带位于中亚造山带西南缘,是探索中亚造山带增生造山过程的重要窗口.西北天山是伊犁地块与准噶尔地块的结合部位,保存了两者之间构造演化的重要地质信息.出露于伊犁地块北缘别珍套山的泥盆系是记录西北天山晚古生代早期构造演化过程的重要载体.基于此,对中泥盆统汗吉尕组砂岩进行岩相学和LA-ICP-MS碎屑锆石U-Pb定年与微...     

浙北龙潭组中高岭石泥岩特征及其成因分析

浙北龙潭组C2煤层底板高岭石泥岩经差热、X线衍射、红外吸收光谱和电镜分析，表明它含丰富的粘土矿物，以高岭石和7埃洛石为主，而石英、菱铁矿、蒙托石和有机质等为次。文中对粘土矿物的特征及形成环境和成因进行了讨论。高岭石泥岩层位稳定、蕴藏量大，对煤系对比、煤层勘探开采和综合开发利用均有重要的地质意义。     

Importance of kelp-derived organic carbon to the scallop <Emphasis Type="Italic">Chlamys farreri</Emphasis> in an integrated multi-trophic aquaculture system

Bivalves and seaweeds are important cleaners that are widely used in integrated multi-trophic aquaculture (IMTA) systems. A beneficial relationship between seaweed and bivalve in the seaweed-based IMTA system has been confirmed, but the trophic importance of seaweed-derived particulate organic materials to the co-cultured bivalve is still unclear. We evaluated the trophic importance of the kelp Saccharina japonica to the co-cultured scallop Chlamys farreri in a typical IMTA farm in Sungo Bay (Weihai, North China). The dynamics of detritus carbon in the water were monitored during the culturing period. The proportion of kelp-derived organic matter in the diet of the co-cultured scallop was assessed via the stable carbon isotope method. Results showed that the detritus carbon in the water ranged from 75.52 to 265.19 μg/L, which was 25.6% to 73.8% of total particulate organic carbon (TPOC) during the study period. The amount of detritus carbon and its proportion in the TPOC changed throughout the culture cycle of the kelp. Stable carbon isotope analysis showed that the cultured scallop obtained 14.1% to 42.8% of its tissue carbon from the kelp, and that the percentages were closely correlated with the proportion of detritus carbon in the water (F =0.993, P= 0.003). Evaluation showed that for 17 000 tons (wet weight) of annual scallop production, the kelp contributed about 139.3 tons of carbon (535.8 tons of dry mass). This confirms that cultured kelp plays a similar trophic role in IMTA systems as it does in a natural kelp bed. It is a major contributor to the detritus pool and supplies a vital food source to filter-feeding scallops in the IMTA system, especially during winter and early spring when phytoplankton are scarce.     

华东地区MODIS与OMI气溶胶光学厚度数据融合

气溶胶光学厚度（AOD）表征气溶胶对光的衰减作用,体现大气混浊度或大气中气溶胶总含量,其卫星产品是研究近年来不断恶化的大气环境与空气质量的良好数据源。AOD卫星产品种类较多,但数据存在较大的不确定性;气溶胶全球监测网（AERONET）的地基数据精度高,但空间覆盖度较差。泛克里金法（UK）能在数据融合过程中更多地考虑描述对象的空间相关性,并且简单易行、结果可靠。因此,本文采用该方法,结合二次多项式波段插值法和回归分析方法,在AERONET AOD数据的基础上,对2008年11月华东地区臭氧监测仪（OMI）和中分辨率成像光谱仪（MODIS）的AOD产品进行了融合。结果表明：二次多项式的AOD波段插值方法,能提供比Angstrom波长指数法更为精准的AOD插值结果;AOD融合产品的空间分辨率高于OMI AOD,覆盖率大于OMIAOD和MODIS AOD,且其精度优于这2种AOD卫星产品;融合产品图显示,2008年11月,华东地区的AOD总体呈现南低北高的趋势,高值区主要分布在长江三角洲部分地区、安徽东北部、苏鲁交界处,以及山东西部;低值区主要为江苏以南大部。相比于前人研究,本文证实了AERONET AOD站点数据少、融合的数据源（卫星AOD产品）过境时间不一致的情况下,UK方法仍然有效。本文提出的融合系统,可为相关研究提供空间覆盖更全、精度更高的AOD数据。     

安徽铜山铜(金)矿床锆石U-Pb年代学和Hf同位素地球化学

安徽池州的铜山岩体是长江中下游地区沿江岩浆岩主带中的含矿岩体之一,其形成年龄及岩石成因尚存在争议。该岩体主要由石英闪长玢岩、石英二长斑岩和花岗闪长岩组成,与铜金矿化关系密切。对铜山矽卡岩型铜(金)矿床的花岗闪长岩开展了锆石U-Pb定年和Hf同位素地球化学研究。岩石地球化学及同位素年代学研究结果表明:花岗闪长岩侵入年龄为(146.3±3.2)Ma,形成于早白垩世;锆石εHf(t)值平均为-5.23,说明铜山侵入岩具有壳幔混合的岩浆岩源区性质;锆石的二阶段Hf模式年龄分布在1 184.51~1 422.72Ma之间,说明岩浆源区与皖南地区出露的中元古代基底有密切关系。构造判别图解显示,铜山岩体属火山弧花岗岩,与长江中下游铜金矿床含矿岩体形成于同一构造背景下,据此推测铜山地区大地构造背景形成于与古太平洋板块俯冲密切相关的大陆边缘岩浆弧环境。     

Spatial-temporal heterogeneity of industrial structure transformation and carbon emission effect in Xuzhou Metropolitan Area

Employing decoupling index and industrial structure characteristic bias index methods, this study analyzed the spatial-temporal characteristics of industrial structure transformations and their resulting carbon emissions in the Xuzhou Metropolitan Area from 2000 to 2014, with a focus on their relationships and driving factors. Our research indicates that carbon emission intensity from industrial structures in the Xuzhou Metropolitan Area at first showed an increasing trend, which then decreased. Furthermore, the relationship between emissions and industrial economic growth has been trending toward absolute decoupling. From the perspective of the center-periphery, the Xuzhou Metropolitan Area formed a concentric pattern, where both progress towards low emissions and the level of technological advancement gradually diminished from the center to the periphery. In terms of variation across provinces, the ISCB index in the eastern Henan has decreased the slowest, followed by the southern Shandong and the northern Anhui, with the northern Jiangsu ranking last. During this period, resource- and labor- intensive industries were the primary growth industries in the northern Anhui and the eastern Henan, while labor-intensive industries dominated the southern Shandong and capital-intensive industries dominated the northern Jiangsu. In terms of city types, the spatial pattern for industrial structure indicates that recession resource-based cities had higher carbon emission intensities than mature resource-based cities, followed by non-resource-based cities and regenerative resource-based cities. Generally, the industrial structure in the Xuzhou Metropolitan Area has transformed from being resource-intensive to capital-intensive, and has been trending toward technology-intensive as resource availability has been exploited to exhaustion and then been regenerated. Industrial structure has been the leading factor causing heterogeneity of carbon emission intensities between metropolitan cities. Therefore, the key to optimizing the industrial structure and layout of metropolitan areas is to promote industrial structure transformation and improve the system controlling collaborative industrial development between cities.