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1.
根据采自湖北宜昌分乡陈家河和远安真金两剖面奥陶系牯牛潭组至宝塔组的牙形刺,将该段地层的牙形刺生物带自上而下综合划分为Hamarodus brevirameus,Amorphognathus superbus,Baltoniodus alobatus,Pygodus anserinus-Yangtzeplacognathus jianyeensis,Yangtzeplacognathus protoramosus,Yangtzeplacognathus foliaceus,Histiodella kristinae-Eoplacognathus suecicus,Dzikodus tablepointensis,Lenodus variabilis和Lenodus antivariabilis等牙形刺生物带。其中宝塔组之Hamarodus brevirameus,Amorphognathus superbus生物带及Baltoniodus alobatus生物带顶部归为凯迪阶(Katian),庙坡组Baltoniodus alobatus生物带大部和Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带中上部归为桑比阶(Sandbian),而牯牛潭组的Yangtzeplacognathus protoramosus至Lenodus antivariabilis等牙形刺生物带和庙坡组Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带下部则归入达瑞威尔阶(Darriwillian)。这一牙形刺带序列与宜昌黄花场和分乡剖面的牙形刺生物带相一致。  相似文献   

2.
本文详细描述了重庆石柱漆辽剖面奥陶系达瑞威尔阶(Darriwilian)牯牛潭组至凯迪阶(Katian)宝塔组的牙形刺序列及其对比。牙形刺序列由上而下可分为:宝塔组Hamarodus brevirameus生物带和Amorphognathus superbus生物带;大田坝组的Baltoniodus alobatus,Baltoniodus variabilis和Yangtzeplacognathus jianyeensis生物带;牯牛潭组的Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带。其中Hamarodus brevirameus生物带至Baltoniodus alobatus生物带上部为凯迪阶,B.alobatus生物带下部至Yangtzeplacognathus jianyeensis生物带上部为桑比阶(Sandbian),而Yangtzeplacognathus jianyeensis生物带下部,Yangtzeplacognathus crassus生物带和Lenodus variabilis生物带归入达瑞威尔阶。根据文中所识别的牙形刺序列,该剖面显然缺失了达瑞威尔阶中上部的牙形刺生物带如Pygodus serra生物带(即Yangtzeplacognathus protoramosus和Y.foliaceus生物带),Eoplacognathus suecicus和Dzikodus tablepointensis生物带。因此,在重庆石柱漆辽剖面奥陶系牯牛潭组和大田坝组之间的地层是不连续的,存在一明显的沉积间断,缺失了相当于牯牛潭组标准剖面中上部的地层(达瑞威尔阶中上部)。而这一沉积间断所发生的时间正好与达瑞威尔中晚期全球海平面下降相吻合。  相似文献   

3.
首次在新疆塔里木盆地塔中地区中2井上奥陶统良里塔格组礁岩中发现保存精美的牙形刺化石,包括6属13种和未定种,含一个新亚种Belodina longxianensis minor subsp.nov.。根据牙形刺化石确定,良里塔格组上部属于上奥陶统中部的Belodina confluens带。中2井良里塔格组第2—4层生物礁发育的精确时代是Belodina confluens带。  相似文献   

4.
开展陕西宁强范家沟、赵家坝和四川广元谭家沟3条剖面奥陶系牙形刺生物地层研究。在宁强地区"涧草沟组"发现了凯迪阶中部的Protopanderodus insculptus生物带,它相当于湖北宜昌地区上奥陶统临湘组之同名带;宝塔组由上而下可划分为Hamarodus brevirameus,Baltoniodus variabilis,Yangtzeplacognathus jianyeensis和Y.foliaceus等牙形刺带,属达瑞威尔阶上部至凯迪阶下部,可与湖北宜昌地区中-上奥陶统牯牛潭组顶部至宝塔组的同名带对比;广元地区宝塔组则见Baltoniodus variabilis和Yangtzeplacognathus jianyeensis生物带,属达瑞威尔阶顶部至桑比阶,可与湖北宜昌地区庙坡组或南京地区大田坝组的同名带对比。上述发现改变了先前的认识:陕西宁强地区宝塔组划分为Hamarodus europaeus和Eoplacognathus jianyeensis两牙形刺带,与湖北宜昌地区庙坡组和宝塔组地层相当;四川广元地区宝塔组归入Pygodus serra-Eoplacognathus foliaceus牙形刺带,与湖北宜昌地区牯牛潭组对比。邱洪荣(1989)建立的4个新种可能是一些老属种不同形态的组成分子,因此在本文属种描述部分把它们分别列入相应属种的同义名录。  相似文献   

5.
描述产自浙江常山205国道剖面上奥陶统砚瓦山组的牙形刺,主要有Baltoniodus alobatus,B.variabilis,Periodon aculeatus,Dapsilodus viruensis,Scabbardella altipes和Panderodus gracilis等,可归入Baltoniodus alobatus带。浙赣地区奥陶系砚瓦山组自建立以来都被归入瀚江期,并与宝塔组对比。本文根据当前的发现并结合以前报道的砚瓦山组牙形刺化石,认为砚瓦山组自下而上可识别出Pygodus anserinus,Baltoniodus alobatus和Hamarodus brevirameus(=Hamarodus europaeus)等带,其时代应归为桑比早期至凯迪早期,并可与华南扬子区的庙坡组大部(或大田坝组)至宝塔组对比。其中,Pygodus anserinus带和Baltoniodus alobatus带见于浙江常山、江山地区,Hamarodus brevirameus带则见于江西武宁。在常山黄泥塘金钉子剖面,砚瓦山组底部为Pygodus anserinus带;在常山205国道剖面则见Baltoniodus alobatus带;但在江西武宁地区,砚瓦山组从底部起,几乎全都归为Hamarodus brevirameus带。因而,砚瓦山组在江西武宁与浙江常山等地之底界并不一致,有明显的穿时现象。本文牙形刺生物地层研究还表明,晚奥陶世古滕贝格的δ13 C的正偏移事件(GICE)在常山地区的起始时间不会早于B.alobatus带。  相似文献   

6.
通过对新疆顺北油田B、C两井与塔河油田D井中-上奥陶统牙形刺的研究,从一间房组上部至恰尔巴克组下部识别出Dzikodus tablepointensis,Eoplacognathus suecicus,Pygodus serra和Pygodus anserinus-Yangtzeplacognathus jianyeensis等4个生物带。结合塔河油田A井的牙形刺研究,进而将两个地区的一间房组上部归为中奥陶统达瑞威尔阶中上部,恰尔巴克组归为上奥陶统桑比阶中下部,良里塔格组归为上奥陶统桑比阶中上部至凯迪阶下部,桑塔木组底部归为凯迪阶中部。顺北油田和塔河油田的中-上奥陶统牙形刺生物地层序列可以与塔里木盆地的区域标准牙形刺生物带进行对比。  相似文献   

7.
中国新疆塔克拉玛干沙漠井下奥陶系的牙形刺   总被引:9,自引:3,他引:6  
共测制了13条新疆塔时木塔克拉玛干沙漠中部和北部井下的奥陶系剖面,并在不同的相区发现了不同的牙形刺序列。在北部地区牙形刺带由上而下为:Aphelognathus pyramidalis,Yaoxianognathus yaoxianensis-Belodi-na confluens,Baltoniodus alobatus,Pygodus anserinus,P.serra,Paroistodus proteus,Glyptoconus quadraplicatus和Rossodus manitouensis-Cordylodus rotundatus等带;在中部区,牙形刺带由上而下为:Serratognathus diver-sus,Chosonodina和Rossodus manitouensis-Cordylodus rotundatus等带,另外,本文也讨论了牙形刺带的对比,生物相及本区的古地理轮廓变化,描述了新种Pygodus xinjiangensis。  相似文献   

8.
本文描述了采自湖北宜昌远安真金和界岭剖面奥陶系牯牛潭组顶部的牙形刺,它们有Baltoniodus prevariabilis,Drepanoistodus venustus,Panderodus gracilis,Periodon aculeatus,Protopanderodus calceatus,P.varicostatus?,Yangtzeplacognathus foliaceus和Y.protoramosus等,确认宜昌地区牯牛潭组顶部应归属于奥陶系达瑞威尔阶Pygodus serra带之Yangtzeplacognathus protoramosus亚带,并可与宜昌黄花场剖面和南京汤山外杆沟剖面同名组顶部及新疆柯坪羊吉坎剖面一间房组顶部的牙形刺带相对比。同时,它要比重庆城口大槽剖面牯牛潭组顶部的牙形刺带低3个带(Pygodus anserinus带至Baltoniodus variabilis带),这一事实也说明了牯牛潭组顶部在中国扬子地台的穿时性。  相似文献   

9.
皖南石台地区奥陶系牙形刺   总被引:8,自引:5,他引:3  
本文研究了安徽省石台地区奥陶系红花园组至汤山组牙形刺的组合特征及其序列,共发现了牙形刺36属64种。文中描述其中地层意义较大的12属16种。建立了12个牙形刺化石带,其中一组合带。自上而下为: Hamarodus europacus带;Amorphognathus superbus带;Amorphognathus tvearensis带; Baltoniodus variabilis带;Pygodus anserinus-Eoplacognathus jianyeensis带; Pygodus serrus带;Eoplacognathus suecicus带;Amorphognathus variabilis带; Paroistodus originalis带; Periodon flabellum带;Oepikodus evae带; Serratognathus tangshanensis带。 本区奥陶系牙形刺的面貌属北大西洋生物地理区。这些牙形刺化石带基本上可与我国宜昌地区、宁镇地区以及西欧奥陶系的牙形刺化石带进行对比。  相似文献   

10.
本文针对湖北松滋响水洞剖面及建始小茶园剖面牯牛潭组至宝塔组地层进行了详细的牙形类序列分析及对比。研究结果表明,自下而上可识别7个牙形类化石带,分别是Lenodus antivariabilis带、Lenodus variabilis带、Yangtzeplacognathus crassus带、Dzikodus tablepointensis带、Yangtzeplacognathus foliaceus带、Yangtzeplacognathus jianyeensis带及Hamarodus brevirameus带。剖面牙形类序列与华南中晚奥陶世综合序列基本一致,但缺失达瑞威尔晚期牙形类生物带(Eoplacognathus suecicus带至Yangtzeplacognathus protoramosus带)的完整记录,这一缺失在扬子台地多个剖面均有记录,可能指示达瑞威尔晚期存在的区域性海平面变化以及全球海洋古环境变化事件。关键词牙形类生物地层地层缺失牯牛潭组–宝塔组中–上奥陶统湖北地区  相似文献   

11.
A new polynitro cage compound 2, 4, 6, 8, 10, 12, 13, 14, 15-nonanitro-2, 4, 6, 8, 10, 12, 13, 14, 15-nonaazaheptcyclo [5.5.1.1(3,11).1(5,9)] pentadecane (NNNAHP) was designed in the present work. Its molecular structure was optimized at the B3LYP/6-31 G(d,p) level of density functional theory (DFT) and crystal structure was predicted using the Compass and Dreiding force fields and refined by DFT GGA-RPBE method. The obtained crystal structure of NNNAHP belongs to the P-1 space group and the lattice parameters are a = 9.99 ?, b = 10.78 ?, c = 9.99 ?, α = 90.01°, β = 120.01°, γ = 90.00°, and Z = 2, respectively. Based on the optimized crystal structure, the band gap, density of state, thermodynamic properties, infrared spectrum, strain energy, detonation characteristics, and thermal stability were predicted. Calculation results show that NNNAHP has detonation properties close to those of CL-20 and is a high energy density compound with moderate stability.  相似文献   

12.
13.
The variation with age of the 18 trace element mass fractions and some histological characteristics of intact prostate glands of 50 subjects aged 0–30 years was investigated by instrumental neutron activation analysis, inductively coupled plasma atomic emission spectrometry, and a quantitative morphometric analysis. Mean values ± standard error of the mean (M ± SΕΜ) for the mass fractions (in milligrams per kilogram wet tissue) of these trace elements in pre-puberty were: Al 28.5 ± 9.0, B 0.40 ± 0.11, Ba 1.48 ± 0.44, Br 10.5 ± 1.5, Ca 241 ± 30, Cl 3,203 ± 278, Cu 3.51 ± 0.89, Fe 33.7 ± 4.1, K 2,364 ± 145, Li 0.020 ± 0.004, Mg 153 ± 23, Mn 0.46 ± 0.06, Na 2,286 ± 130, P 1,391 ± 100, S 1,698 ± 132, Si 62 ± 11, Sr 0.38 ± 0.08, and Zn 27.6 ± 2.3. During puberty and postpuberty, when there is a significant increase in circulating androgens, the mean values were: Al 7.2 ± 1.4, B 0.21 ± 0.05, Ba 0.25 ± 0.06, Br 5.8 ± 1.0, Ca 433 ± 81, Cl 2,314 ± 201, Cu 1.77 ± 0.13, Fe 20.9 ± 1.6, K 2,585 ± 118, Li 0.0088 ± 0.0014, Mg 232 ± 27, Mn 0.34 ± 0.04, Na 1,875 ± 107, P 1,403 ± 98, S 1,673 ± 73, Si 22.2 ± 3.1, Sr 0.22 ± 0.03, and Zn 93.3 ± 8.9. Mean values (M ± SΕΜ) of percent volumes (%) of the stroma, epithelium and lumen in the prostate before puberty were 73.4 ± 2.6, 20.4 ± 1.7, and 4.45 ± 0.94, respectively, versus 46.5 ± 2.5, 38.5 ± 1.9, and 14.9 ± 1.2 during puberty and postpuberty. This work’s results confirm that the Zn mass fraction in prostate tissue is an androgen-dependent parameter. For the first time it has been demonstrated that the glandular lumen is a main pool of Ca, Mg, and Zn accumulation and that the stroma is a main pool of Al, B, Ba, Br, Cl, Cu, Fe, Mn, Na, and Si accumulation in the normal human prostate, for the age range 0–30 years. It was concluded that the Ca, Mg, and Zn binds tightly within the prostatic fluid, because the volume of glandular lumen reflects the volume of prostatic fluid.  相似文献   

14.
The effect of age and gender on major, minor, and trace element contents in the intact rib bone of 80 relatively healthy 15–55-year-old women and men was investigated. Contents or upper limit of contents of 16 chemical elements in the rib bone were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Mean values (M?±?SΕΜ) for the mass fraction of Ba, Ca, Cu, Fe, K, Li, Mg, Na, P, S, Sr, and Zn (milligram per kilogram of dry bone) were as follows: 2.54?±?0.16, 171,400?±?4,050, 1.35?±?0.22, 140?±?11, 1,874?±?71, 0.049?±?0.011, 2,139?±?38, 5,378?±?88, 75,140?±?1,660, 1,881?±?51, 291?±?20, and 92.8?±?1.5, respectively. The upper limits of contents of Al, B, Mn, and V were <7.20, <0.65, <0.36, and <0.03, respectively. Statistically significant tendency for the Ca, Mg, and P content to decrease with age was found in the human rib bone, regardless of gender. The mass fraction of Fe in the male rib bone increases with age. It was shown that higher Ca, Mg, Na, P, and Sr mass fractions as well as lower Fe content were typical of female ribs as compared to those in male ribs.  相似文献   

15.
The goal of this article was to establish reference ranges of the concentration of trace elements in human serum and to compare these results with those reported by other authors. We describe the sample preparation and measurement conditions that allow the rapid, precise, and accurate determination of Al, As, B, Be, Cd, Co, Cu, Fe, Li, Mn, Mo, Ni, Rb, Se, Sr, and Zn in human serum samples (n=110) by inductively coupled plasma-mass spectrometry (ICP-MS). Accuracy and precision were determined by analyzing three reconstituted reference serum samples by comparison with other methods and by the standard addition procedure. The advantages of the ICP-MS method include short time of analysis of the elements mentioned, low detection limit, high precision, and high accuracy. Disadventages include a high risk of contamination due to the presence of some of the elements of interest in the environment, the relatively delicate sample handling, and the high cost of the equipment.  相似文献   

16.
Summary Concentration of N, P, K, Ca, Mg and S in summer groundnut crop was higher than in kharif while Zn, Fe, Mn and Cu contents were higher in summer crop. Kernel's N, P and Zn; Leaflet's Ca and Mn; Stem's K and Fe; Root's S and Cu and Petiole's Mg contents were highest. Shell's N, P, K, Mg, S, Zn and Cu; Kernel's Ca, Fe and Mn contents were the least. N, P, K, S, Zn and Cu concentrations decreased linearly as the crop grew. Ca, Mg, Fe and Mn concentrations did not display any distinct pattern. Ca concentration was positively correlated with pod yield in both the seasons.  相似文献   

17.
《Ibis》1894,36(3):447-460
  相似文献   

18.
This report attempts to formulate reference ranges of elemental concentrations for 15 trace elements in selected human tissues and body fluids. A set of samples consisting of whole blood, blood serum, urine, milk, liver, and hair were chosen and considered for 15 elements of biological significance: As, Cd, Co, Cr, Cu, F, Fe, I, Hg, Mn, Mo, Ni, Pb, Se, and Zn. The results represent wholly or partially data received from 40 countries of the global regions of Africa, Asia, Europe, North, South, and Central America, Australia, and New Zealand. This survey, even if qualitative, has been useful in demonstrating certain trends of trace-element scenarios around the world. It is of course recognized that both diet and environment exert a strong influence on the distribution pattern of several elements, such as As, Cd, Mn, Pb, Se, and Zn. A limited comparison of the available information on soil status of different countries reflected some interesting associations for elements, such as Mn and Zn. Importantly, this study revealed that only a few countries were in a position to identify a reasonable amount of data on samples requested for this project. Regretably, for a number of countries, any dependable data for even such essential elements as Cu, Fe, and Zn were not available. In view of the nutritional importance of many elements, the time is ripe for concerted efforts by intergovernmental agencies to initiate investigations or commission task forces/projects to generate reliable reference data for selected global regions, which sadly lack data of any kind at present.  相似文献   

19.
20.
We report 19 new species records for the faunal list of Coleoptera in New Brunswick, Canada, six of which are new records for the Maritime provinces, and one of which is new Canadian record. We also provide the first recent records for five additional species in New Brunswick. One new species of Stenotrachelidae, Cephaloon ungulare LeConte, is added to the New Brunswick faunal list. Additional records are provided for Cephaloon lepturides Newman, as well the first recent record of Nematoplus collaris LeConte. Two species of Oedemeridae, Asclera puncticollis (Say) and Asclera ruficollis (Say), are newly reported for New Brunswick, and additional locality and bionomic data are provided for Calopus angustus LeConte and Ditylus caeruleus (Randall). The records of Ditylus caerulus are the first recent records for the province. Three species of Meloidae, Epicauta pestifera Werner, Lytta sayi LeConte, and Meloe augustcollis Say are reported the first time for New Brunswick; Epicauta pestifera is newly recorded in Canada. Lacconotus punctatus LeConte and the family Mycteridaeis newly recorded for New Brunswick. The first recent records of Borus unicolor Say (Boridae) are reported from the province. One new species of Pythidae, Pytho siedlitzi Blair, and the first recent records of Pytho niger Kirby are added to the faunal list of New Brunswick. Three species of Pyrochroidae are newly reported for the province, including Pedilus canaliculatus (LeConte) and Pedilus elegans (Hentz), which are new for the Maritime provinces. Five species of Anthicidae and the first recent record of Anthicus cervinus LaFerté-Sénectére are newly reported for New Brunswick. Anthicus melancholicus LaFerté-Sénectère, Sapintus pubescens (LaFerté-Sénectère), Notoxus bifasciatus (LeConte), and Stereopalpus rufipes Casey are new to the Maritime provinces faunal list. Ambyderus granularis (LeConte) is removed from the faunal list of the province. Three species of Aderidae, Vanonus huronicus Casey, Zonantes fasciatus (Melsheimer), and Zonantes pallidusWerner, are newly recorded for New Brunswick; Zonantes fasciatus and Vanonus huronicus are new for the Maritime provinces' faunal list. Collection data, bionomic data, and distribution maps are presented for all these species.  相似文献   

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