大别山宿松变质带~1.38 Ga花岗质岩浆作用的厘定及其对Columbia超大陆裂解的启示

宿松变质带位于大别碰撞造山带的南部,是一个相对低级变质的构造岩石单元,然而,却具有复杂的岩石组成和成因,并发育了被构造肢解、破碎的新太古代、古元古代和新元古代的变质岩石地层单位及相关的变质火成岩,为研究前寒武纪超大陆的聚合与裂解在研究区的响应提供了极其重要的对象和靶区。但是,研究区乃至扬子北缘都缺乏中元古代的火成岩。本文通过对宿松变质带北浴地区花岗片麻岩的岩石学、元素地球化学和锆石U-Pb年代学等方面的综合研究,首次发现研究区存在中元古代的花岗质岩石,其形成时代为~1.38Ga。全岩主微量元素地球化学特征及高的Zr饱和温度(875℃)表明,该类岩石的原岩属于板内A型花岗岩,形成于大陆裂解构造环境,是Columbia超大陆裂解在研究区的岩石学响应。结合已查明的~2.0Ga岩浆作用及相关盆地沉积,证明扬子北缘宿松变质带中原“宿松群”的部分岩石属于Columbia超大陆的一部分。

大别山晓天—磨子潭断裂附近退变榴辉岩的厘定及其时代和大地构造意义

研究区位于大别造山带晓天—磨子潭断裂附近(图1)。晓天—磨子潭断裂是北大别杂岩带和北淮阳带之间的边界断裂,部分研究者认为该断裂带为华北板块和扬子板块之间的缝合线以及大别山超高压变质岩折返的重要边界(Faure et al.,1999;徐树桐等,2002),但对此仍存在较大争议。

Detrital Zircon Geochronology and Provenance of Metasedimentary Rocks from the Susong Complex Zone in the Dabie Orogen

The Susong complex zone is a relatively low-grade metamorphic unit located in the southern part of the Dabie orogen and preserves a variety of metasedimentary rocks,mostly with epidote-amphibolite facies.However,their depositional age,provenance and tectonic setting of sedimentary protolith remain controversial due to the lack of fossils,precise dating and integrated geochemical investigation.This study has conducted whole-rock elemental,and zircon U-Pb SHRIMP dating and Lu-Hf isotope analyses on three types of representative metasedimentary rocks including garnetbearing mica-quartz schist,graphite-muscovite-quartz schist and dolomitic marble from the Susong complex zone.The UPb SHRIMP dating data indicate that the sedimentary protolith of these rocks have the maximum depositional ages of less than 840-750 Ma and have various sedimentary provenances.In combination with zircon Lu-Hf isotope compositions,the provenance of the metasedimentary rocks in the region is for the first time documented to be mainly derived from four groups of magmatic rocks formed at~2.5 Ga,~2.0 Ga,~1.4 Ga and~0.8 Ga in response to four episodes of igneous activity in the northeastern margin of the Yangtze Block.The conventional geothermobarometry combined with rare metamorphic zircon ages indicate that the studied rocks underwent the Late Triassic continental subduction-related metamorphism with peak epidote-amphibolite facies conditions at P=0.34-0.91 GPa and T=427-532°C.In addition,results of the elemental contents(i.e.,La,Ce,Th andΣREE)and ratios(i.e.,Eu/Eu^(*)and La_(N)/Yb_(N))suggest that the protoliths of the metasedimentary rocks were mainly shales,wackes and limestones,most probably related to the Rodinia supercontinent rifting along the northern margin of the Yangtze Block during the Neoproterozoic.

大别山北淮阳带奥陶纪花岗岩的厘定及其对北秦岭东延的启示

详细的野外地质调查以及锆石SHRIMP U-Pb定年和初步的岩石学研究表明,大别山北淮阳带东段发育早古生代奥陶纪花岗岩。这些花岗岩经过了强烈的构造变形、局部发育片麻理和绿帘角闪岩相变质作用,形成时代为457±2 Ma,与北淮阳带西段马畈闪长岩的形成时代以及北秦岭‒桐柏造山带一期与大洋俯冲相关的早古生代岛弧岩浆作用时代一致。结合区域地质背景和盆地沉积分析,证明北秦岭古生代俯冲增生造山带至少向东延伸到大别山北淮阳带的金寨及相邻地区。研究区古生代花岗岩及相关岩石的进一步研究,将为大别山碰撞造山带的古生代构造演化以及华南与华北板块之间的汇聚‒拼贴过程提供新的制约。

北大别的多期深熔作用及山根垮塌的新证据

大别山是由华南板块在245~ 210 Ma向华北板块之下俯冲并发生陆陆碰撞形成的.随着南、北板块的汇聚继续,地壳持续加厚.然而,加厚的下地壳岩石(特别是镁铁质下地壳岩石)在重力作用下密度增大、稳定性降低,在145~ 130 Ma时发生深熔作用;130 Ma左右加厚下地壳拆沉,引发软流圈上涌,产生了130 ~ 110 Ma的大规模镁铁质和花岗质岩浆作用以及北大别发生强烈的混合岩化作用.其中,北大别混合岩中不同类型浅色体(至少可以分为4种)和碰撞后变质闪长岩的甄别及其岩石地球化学和同位素年代学方面系统研究为大别山印支期深俯冲陆壳的折返以及燕山期镁铁质下地壳岩石拆沉和山根垮塌所引发的多期深熔作用提供了新的关键证据.山根垮塌诱发的地幔对流导致~ 145 Ma时岩石圈开始减薄,进而导致加厚镁铁质下地壳温度和地壳中下部地热增温率升高,并使其发生部分熔融;加厚下地壳的部分熔融导致造山带下地壳持续弱化,加剧其重力不平衡,从而引发深部俯冲的镁铁质下地壳岩石的大规模拆沉和山根垮塌.

中药熏洗联合揿针八髎穴治疗混合痔术后疼痛临床观察

目的:观察中药熏洗联合揿针八髎穴治疗混合痔术后疼痛的临床疗效。方法:选取混合痔术后疼痛患者60例,分为治疗组和对照组各30例。治疗组采用常规换药及中药熏洗联合揿针八髎穴疗法治疗,对照组采用常规换药及1∶5000高锰酸钾溶液熏洗疗法治疗,观察记录两组在术后第1、3、5、7 d的疼痛评分,并采用统计学方法加以对比。结果:两组术后第1 d疼痛评分对比,未有显著差异(P>0.05)。术后第3、5、7 d疼痛评分对比,治疗组明显优于对照组(P<0.05)。对照组有效率为73.33%,治疗组有效率为93.33%,经秩和检验,具有显著差异(P<0.05)。结论:中药熏洗联合揿针八髎穴治疗混合痔术后疼痛疗效可靠,明显优于高锰酸钾熏洗疗法。

Tectonic Framework and Evolution of the Dabie Mountains in Anhui, Eastern China

The Dabie Mountains are believed to be a collisional orogenic belt between the Yangtze amd Sino-Koreancontinental plates. It is composed of the foreland fold-thrust zone, the subducting cover and basement of theYangtze continental plate, the coesite- and diamond-bearing ultra-high pressure metamorphic zone and themeta-ophiolitic melange zone in the subducting basement, the fore-arc flysch nappe and the back thrust zoneoccurring respectively on the southern and northern margins of the Sino-Korean continental plate and the in-herited basin with molassic deposits on the northern margin. When the palaeo-Dabie oceanic plate subductednorthward in the Early Palaeozoic, volcanic arc and back arc basin probably formed on the southern margin ofthe Sino-Korean continental plate. The Sm / Nd isotopic dating of the strata and eclogite which were drawn in-to the foreland fold-thrust zone indicates that the intense collision of the two continental plates took place inthe Early Mesozoic.

Paleoproterozoic Multistage Metamorphic Ages Registered in the Precambrian Basement Rocks at the Southeastern Margin of the North China Craton and Their Geological Implications

The Precambrian basement rocks in the Bengbu and neighboring areas, located at the southeastern margin of the North China Craton, occur as granulite terrains and xenoliths in the Mesozoic dioritic porphyry.

New U-Pb Geochronological Constraints on Formation and Evolution of the Susong Complex Zone in the Dabie Orogen

Objective The Susong complex zone（SCZ）is a relatively lowgrade metamorphic unit mostly with an epidoteamphibolite facies,located in the southernmost part of the Dabie orogen.However,its rock compositions,ages,

基于工业物联网的智能工程机械管控平台的设计

以工业物联网为核心,综合运用了分布式异构设计,开发了智能工程机械管控平台。该平台主要涵盖WEB服务器(阿里云)、MQTT服务器(阿里云)、操作管理装置(树莓派)、现场控制装置(嵌入式开发板)、电力拖动等执行传感机构以及机械结构的设计。平台可实现工地管理人员对全厂调度优化、工程机械管理、人事管理和远程机械控制,加强了工地的管理控制,降低了整个工地管理成本。同时驾驶员进行远程作业,在保障驾驶员身心安全、改善驾驶环境的同时,降低了工地人力成本。

Multistage Metamorphic Evolution and P-T-t Path of High-T Eclogite from the North Dabie Complex Zone during Continental Subduction and Exhumation

Objective High-T eclogites from the North Dabie complex zone （NDZ）, central China underwent a complex metamorphic evolution involved in ultrahigh-pressure （UHP） and high- pressure eclogite-facies metamorphism, and subsequent granulite-facies overprinting and amphibolite-facies retrogression during the Mesozoic continental deep subduction and exhumation. As a consequence, the eclogites were strongly affected by multiple decompression and re-crystallization processes during exhumation. Some eclogites have even been wholly transformed to garnet granulite, or garnet amphibolite, or even garnet-absent amphibolite.

耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻临床研究

目的:观察耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻的临床疗效。方法:68例不完全性肠梗阻患者随机分对照组和治疗组各34例。对照组给予常规治疗;治疗组在对照组治疗基础上给予耳穴压豆(取交感、大肠、小肠穴,用王不留行籽固定在穴位上,间断指压,左右耳交替进行,每日左右耳各1次,共5 d)、针灸(取天枢、大横、足三里,针刺按虚补实泻法操作,共5 d)及脐疗(生大黄、芒硝、吴茱萸、生姜、葱白共研末,以蜂蜜调制,装入脐贴壳,贴敷于患者脐部神阙穴紧贴皮肤,每次2 h,每日2次,共5 d)。治疗后,比较两组患者临床疗效、主要症状积分、消化功能、血清胃泌素水平。结果:(1)治疗组有效率为93.1%(31/33),治愈率为69.7%(23/33);对照组有效率为78.1%(25/32),治愈率为50.0%(16/32),两组有效率和治愈率比较,差异均有统计学意义(P<0.05)。(2)治疗后,两组患者主要症状积分均低于本组治疗前;治疗组主要症状积分为(16.43±1.44)分,对照组主要症状积分为(28.32±0.79)分,治疗组低于同期对照组(P<0.05)。(3)治疗后,治疗组恢复排气时间为(80.56±11.34)h、恢复排便时间为(99.43±16.22)h、胃管拔除时间为(113.91±10.23)h、饮食恢复时间为(124.18±10.33)h、住院时间为(8.18±0.24)d,均低于同期对照组(P<0.05)。(4)治疗后,两组患者血清胃泌素水平均高于本组治疗前;治疗组血清胃泌素水平为(87.83±1.56)ng·L^(-1),对照组血清胃泌素水平为(73.32±0.29)ng·L^(-1),治疗组高于同期对照组(P<0.05)。结论:耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻疗效显著,能有效促进消化功能恢复,缩短住院时间,提高血清胃泌素水平。

大别山北淮阳带东段石榴斜长角闪岩石炭纪变质作用的测定

北淮阳带位于大别碰撞造山带北部,相对于南部三叠纪超高压变质带来说,通常被认为是一个相对低级变质的构造岩石单位.以商(城)-麻(城)为界,分为西段和东段.其中,东段未发现与西段相对应的古生代大洋俯冲记录,也缺乏相关的古生代岩浆作用和变质作用方面报道.因而严重地阻碍了对大别造山带形成和演化的深刻理解和准确认识.北淮阳带东段岩石类型丰富,主要包括3类(套)岩石:(1)变质岩,如变质花岗岩(花岗片麻岩)、(石榴)斜长角闪岩、大理岩、云母石英片岩和变质复理石等;(2)岩浆岩,主要为中生代花岗岩、正长岩和火山岩等;(3)盆地沉积岩,主要为中新生代沉积及少量石炭纪沉积.然而,该区一直未发现古生代变质作用的岩石学记录.为此,对北淮阳带东段金寨县铁冲一带与大理岩相共生的石榴斜长角闪岩开展了锆石SHRIMP U-Pb定年和初步的岩石学研究.结果表明,该区石榴斜长角闪岩经历了355±5 Ma变质作用,因而首次发现研究区经历了石炭纪变质作用,为秦岭-桐柏造山带的东延以及大别山碰撞造山带的古生代构造演化过程提供了新的制约.

大别造山带在大陆裂解、地壳的俯冲-折返及山根垮塌期间的多期部分熔融作用

大别造山带发育了与大陆俯冲-折返和碰撞造山等相关的不同构造岩石单位.针对存在的问题,本项研究开展了宿松变质带、中大别超高压带和北大别杂岩带等不同俯冲岩片花岗质岩石的野外地质调查以及岩石学、元素-同位素地球化学和锆石年代学等方面系统研究.研究结果表明:(1)宿松变质带花岗片麻岩的原岩时代包括晚太古代(2.5~2.7 Ga)和新元古代(770~830 Ma)两大类,其中新元古代花岗片麻岩的原岩是由经历了~2.0 Ga变质作用的晚太古代岩石在新元古代大陆裂解过程中发生重熔作用形成的;(2)首次揭示中大别花岗片麻岩至少包含两种不同的原岩时代(~750 Ma和780~800 Ma)与岩石成因,并在三叠纪俯冲-折返期间经历了~230 Ma和~220 Ma两期部分熔融作用;(3)北大别混合岩中发育折返早期(209±2 Ma)因高温减压而引起的黑云母脱水熔融以及山根垮塌期间(110~145 Ma)有水加入的加热熔融(水致熔融)形成的多种浅色体;(4)发现并限定了北大别变质闪长岩是在燕山期山根垮塌期间,由三叠纪深俯冲的新元古代镁铁质下地壳岩石发生部分熔融作用而形成的.因此,这为大别造山带在新元古代大陆裂解、印支期地壳的俯冲-折返及燕山期山根垮塌期间发生的多种部分熔融作用提供了新的制约.

Discovery of the eclogite and its petrography in the Northern Dabie Mountain

Eclogite from the Northern Dabie Mountain is a new finding by the authors. These eclogites in foliated perdotite are enveloped by banded gneiss and occur in the mafic-ultramafic rock belt. They are mainly composed of omphacite, garnet, diopside, orthopyroxene, amphibole, plagioclase and magnetite, and a small amount of rutile, spinel, olivin and 鏾rundum. The mineral association of peak metamorphism of the eclogite is omphacite+garnet+rutile. The existence of eclogite in the Northern Dabie Mountain implies that there was an eclogitic metamorphism prior to the granulitic facies one in the mafic-ultramafic rock belt.

Occurrence of Neoproterozoic low-grade metagranite in the western Beihuaiyang zone,the Dabie orogen

Based on detailed field investigations and petrographic observations,we discovered Neoproterozoic-emplaced granite from the metavolcanics of the Dingyuan Formation in the western Beihuaiyang zone,the Dabie orogen. This study reports the results of zircon U-Pb dating and preliminary petrographic observations on two metagranite samples. The studied rocks experienced epidote-amphibolite facies metamorphism and strong structural deformation. Their U-Pb ages are 726 ± 6 and 758 ± 12 Ma,respectively,similar to those for the Luzhenguan complex in the eastern segment of the Beihuaiyang zone. In combination with previously determined 635 ± 5 Ma low-grade metagabbro,this study suggests the occurrence of at least two types of Neoproterozoic intrusive rocks in the Beihuaiyang zone,the northern margin of the South China Block (SCB):726-758 Ma metagranite and 635 Ma metagabbro. These rocks occur within the metamorphosed Ordovician volcanic zone (originally named the Dingyuan Formation) and are in tectonic contact to each other,but they formed in different tectonic settings. The protolith ages for the Neoproterozoic low-grade metaigneous rocks are in good agreement not only with ages for two episodes of mid-and late-Neoproterozoic mafic and felsic magmatism in the Suizhou and Zaoyang area,Hubei Province,but also agree with protolith ages of ultrahigh-pressure metaigneous rocks in the Dabie-Sulu orogenic belt. In view of their tectonic relationships to country rocks,it appears that these Neoproterozoic low-grade rocks are exotic and they may have been detached and scraped from subducting SCB crust in the early Triassic during the initial continental subduction,and thrusted over Paleozoic metamorphosed rocks in the southern margin of the North China Block during continental collision.

北淮阳带东段铁冲石榴斜长角闪岩的变质演化和P-T轨迹

北淮阳带位于大别碰撞造山带北部,相对于南部三叠纪超高压变质带来说,通常被认为是一个相对低级变质的构造岩石单位。以商(城)-麻(城)为界,分为西段和东段。本文对北淮阳带东段新发现的铁冲古生代变质的石榴斜长角闪岩开展了岩相学、矿物化学和热力学研究。结果表明,该类岩石具有石榴子石+斜长石+单斜辉石+切尔马克闪石±石英、低硅角闪石+斜长石+石榴子石+榍石+钛铁矿、普通角闪石+斜长石+榍石+钛铁矿等变质阶段矿物组合。其中,前三个变质阶段温压范围依次为648~719℃/1.0~1.3 GPa,660~686℃/0.71~0.90 GPa,607~647℃/0.27~0.48 GPa。因此,显示近等温减压的顺时针变质P-T轨迹。结合已发表的355±5 Ma峰期变质时代,首次证明北淮阳带东段存在高压变质作用以及石榴斜长角闪岩形成于晚古生代俯冲-碰撞环境。

王爱东:黄河水上的“生命守护者”

人们说,王爱东总也不老。十几年前检察院的同事、三十几年前的铁道兵战友,有些脸上多了皱纹,有些两鬓添了白发。可王爱东还是那个王爱东,六十多岁的人,却有着三十多岁的精气神。2009年,年逾五旬的检察官王爱东,因心脏疾病退居二线。一段职业生涯结束,一段新的人生开启。纯粹、执着、勇敢,穿着淡蓝色的制服衬衫,回首此后12年黄河水上志愿救援队工作,王爱东浅浅地笑着。谁也看不出,眼前这个人曾在鬼门关前走了数遭,胸腔里跳动着的那颗心脏,随时有可能“罢工”。