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Sedimentary environment and provenance of sandstones from the Qadir member in the Nayband Formation, Tabas block, east-central Iran 伊朗中东部塔巴斯区块Nayband组Qadir段砂岩的沉积环境和物源
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A140920
Ehsan Zamaniyan, M. Khanehbad, R. Moussavi-Harami, A. Mahboubi
Qadir Member of Nayband Formation, located in East of Central Iran, has developed to a great extent. Investigation of the lithofacies and sedimentary environment, resulted in identification of the deltaic and marine deposits. Based on field evidence and facies features, Qadir Member consists of two lithofacies, including carbonate and siliciclastic facies. The siliciclastic facies were identified as having four sandstone facies including Sr, Sh, Sp, St, three fine-grained lithofacies, including FI, Fm, Fl (Sr) / Sr (FI) and one coal facies. Also, regarding the field, laboratory studies, and identification of lithofacies, the coastal plain, deltaic (including deltaic plain, proximal delta front, distal delta front, and prodelta) and open marine environments were identified for Qadir Member which is is under the impact of tidal currents. The chemical weathering index (71%) indicated semi-arid to semi-humid conditions and plotting the geochemical data showed the provenance of re-cycling and active continental margin and because of Chemical Index of Alteration, the weathering rate was found to be rather medium to high. The geochemical diagrams also showed a probable source of the intermediate igneous and sedimentary rocks. The active continental margin conditions for this deposit could suggest the Neotethys subduction under Iran’s plate and volcanic activity at the end of Triassic, which coincided with the early Cimmerian orogeny in Alborz and Central East Iranian Microcontinent.
Nayband组Qadir段位于伊朗中部偏东,发育程度较大。对岩相和沉积环境的调查,确定了三角洲和海洋沉积物。根据野外证据和岩相特征,Qadir段由碳酸盐相和硅质碎屑两个岩相组成。硅化碎屑相具有四个砂岩相,包括Sr、Sh、Sp、St,三个细粒岩相,包括FI、Fm、Fl(Sr)/Sr(FI)和一个煤相。此外,就现场、实验室研究和岩相鉴定而言,Qadir段的海岸平原、三角洲(包括三角洲平原、近端三角洲前缘、远端三角洲前缘和前三角洲)和开阔海洋环境均受到潮流的影响。化学风化指数(71%)表明半干旱至半湿润条件,绘制地球化学数据显示了再循环和活动大陆边缘的来源,由于蚀变化学指数,风化率相当中等至较高。地球化学图还显示了中间火成岩和沉积岩的可能来源。该矿床的活跃大陆边缘条件可能表明,三叠纪末,新特提斯在伊朗板块下俯冲和火山活动,这与阿尔博茨和伊朗中东微大陆的早期Cimmerian造山运动相吻合。
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引用次数: 2
Comment to "Porphyry-related high-sulfidation mineralization early in Central American Arc Development: Cerro Quema deposit, Azuero Peninsula, Panama" by Perelló et al., (2020) Perelló等人对“中美洲弧发育早期与斑岩相关的高硫化矿化:巴拿马阿祖罗半岛Cerro Quema矿床”的评论,(2020)
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A121220
I. Corral
The Cerro Quema Au-Cu deposit is hosted by a dacite dome complex of the Río Quema Formation, a Late Campanian-Maastrichtian volcano-sedimentary sequence of the Panamanian magmatic arc. Its formational age is constrained at ~49 Ma by field evidences, crosscutting relationships and 40Ar/39Ar geochronology (Corral et al., 2016, Corral, 2021). The recent molybdenite Re-Os dates by Perelló et al. (2020) claim that ore is spatially and temporally related to the host volcanic domes at ~71 Ma. After a thorough review of the geologic, geochemical and geochronological data from the Cerro Quema area, it is concluded that the Re-Os dates of Perelló et al. (2020) are not representative of the Cerro Quema formational age. Their proposed formational age at ~71 Ma is significantly older than the age of the host rock (~67 Ma). Furthermore, they invoke a previously unrecognized regional-scale magmatic event solely based on their molybdenite Re-Os dates. Instead, the Cerro Quema genetic model discussed here, in which magmatic-hydrothermal fluids derived from porphyry copper-like intrusions associated with the Valle Rico batholith produced the Au-Cu mineralization at ~49 Ma, is consistent with the geology, geochemistry and geochronology of the Azuero Peninsula.
Cerro Quema Au Cu矿床由Río Quema组的英安岩圆顶杂岩托管,该组是巴拿马岩浆弧的晚Campanian Maastrichtian火山沉积序列。其形成年龄受现场证据、横切关系和40Ar/39Ar地质年代限制在~49 Ma(Corral et al.,2016,Corral,2021)。Perelló等人最近的辉钼矿Re-Os日期。(2020)声称,矿石在空间和时间上与约71 Ma的主火山穹丘有关。在彻底审查了Cerro-Qema地区的地质、地球化学和地质年代数据后,得出结论,Pereló等人的Re-Os日期(2020)不能代表Cerro-Qima地层时代。它们提出的~71 Ma的形成年龄明显大于主岩的年龄(~67 Ma)。此外,他们仅根据辉钼矿Re-Os日期,就援引了以前未被识别的区域规模岩浆事件。相反,这里讨论的Cerro-Qema成因模型与阿祖罗半岛的地质、地球化学和地质年代一致,其中源自与Valle Rico岩基相关的斑岩类铜侵入体的岩浆热液在~49 Ma产生了Au-Cu矿化。
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引用次数: 1
Evolución paleoambiental de la diatomita de Agostitlán, Michoacán, durante la transición Pleistoceno-Holoceno 更新世-全新世过渡时期米却肯阿戈斯蒂兰硅藻土的古环境演变
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A080620
María Sánchez-González, I. I. Alcántara, J. Morales, Avto Goguitchaichvili
El graben de Chapala-Acambay se caracteriza por el registro de yacimientos de diatomitas del Cuaternario con espesores variables, donde domina flora indicativa de lagos profundos. El depósito de diatomita de 6.70 m de espesor de la cuenca de represamiento de Agostitlán contiene un registro paleoambiental que marca la transición de condiciones menos frías de hace ca. 37,000 años cal aP hasta el inicio del Glacial tardío ca. 25,000 años cal aP. En el inicio de la formación del represamiento se desarrolló un cuerpo de agua profundo con dominio de Stephanodiscus niagarae, con escaso aporte de material detrítico dominando las facies arcillosas. Los valores de susceptibilidad magnética en este primer episodio del lago son bajos, con un par de notorios incrementos en la susceptibilidad magnética y asociados a periodos de erosión de las sierras altas que limitan la cuenca. Sucesivamente, hacia las condiciones del lago se vuelven fluctuantes; las facies sedimentarias son más detríticas, alternando con episodios de sedimentación fina, disminuyen las agrupaciones de Stephanodiscus spp y aumentan los porcentajes de Aulacoseira ambigua y Fragilaria spp, lo que sugiere condiciones más frías y alcalinas. La cima de la sucesión se caracteriza por un aumento en la concentración de los minerales magnéticos, así como por un descenso significativo de las especies planctónicas y ticoplanctónicas que vienen sustituidas por formas bentónicas y perifíticas, lo cual se interpreta como una respuesta al incremento de la aridez en esta zona, previo al inicio del Último Máximo Glacial.
查帕拉-阿坎贝地堑的特点是记录了厚度不同的第四纪硅藻土矿床,其中以指示深湖的植物群为主。Agostillán拦河坝盆地6.70 m厚的硅藻土矿床包含一个古环境记录,标志着从大约37000年前的较冷条件过渡到大约25000年前的晚期冰川开始。在筑坝开始时,发育了一个以Stephanodiscus Niagarae为主导的深水体,粘土相中碎屑物质的贡献很少。湖泊第一次发作的磁化率值很低,磁化率有几次明显增加,并与盆地边界的高山侵蚀期有关。随后,湖泊条件变得波动;沉积相更具碎屑性,与精细沉积事件交替发生,Stephanodiscus spp的群减少,模棱两可和脆弱的Aulacoeira spp的比例增加,这表明条件更冷和更碱。演替的高潮是磁性矿物浓度的增加,以及浮游生物和浮游生物物种的显著减少,这些物种被底栖和周边形式所取代,这被解释为对该地区在最后一次冰川高峰开始之前干旱加剧的反应。
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引用次数: 0
Estimación gravimétrica del grosor cortical en el Golfo de California 加利福尼亚湾皮质厚度的重力估计
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A270820
Anaid Fragoso-Irineo, J. Lazcano, Roberto S. Molina-Garza, A. Iriondo
En este estudio se implementa la inversión 3D de datos gravimétricos satelitales mediante el programa 3DINVER.M para modelar el grosor de la corteza en el rift del Golfo de California. Este rift oblicuo separa dextralmente la península de Baja California del continente de Norteamérica desde el Mioceno, periodo en el que se produjo el cambio desde un régimen tectónico fundamentalmente extensional al transtensional presente. A lo largo de su eje, el rift del Golfo de California se encuentra en una fase de oceanización incipiente en varias cuencas de su mitad meridional, mientras que al norte la presencia de corteza oceánica es controvertida. A consecuencia de esta particularidad, la corteza de la cuenca marina del Golfo y la de regiones terrestres adyacentes presentan importantes diferencias de densidad y grosor, siendo ambos parámetros fundamentales del método empleado, y, por ello, se realiza un modelo específico para cada dominio. Los modelos de grosor cortical generados se compararon con las estimaciones puntuales previas basadas en métodos sísmicos, obteniéndose que el 98% de los puntos confrontados del modelo marino y el 87% del terrestre se ajustan a un rango de ±6 km de diferencia, con diferencias promedio absolutas de 1.5 km y de 3.5 km respectivamente. La cuenca del Golfo en los modelos evoluciona a lo largo de su eje y desde el sur al norte desde una corteza híper-adelgazada (~8−12 km), característica de corteza oceánica a transicional, hasta una corteza continental moderadamente adelgazada (~12−18 km). En al área extendida circundante, que completa la denominada como Provincia Extensional del Golfo, la corteza continental varía habitualmente entre ~15 y ~28 km, mientras que en sus flancos la corteza llega a alcanzar los ~35−40 km en los dominios más engrosados (Sierra Madre Occidental y Meseta del Colorado). Asimismo, con base en las estimaciones del grosor cortical y la geología regional, se propone una nueva demarcación para la Provincia Extensional del Golfo.
在本研究中,利用3DINVER程序实现了卫星重力数据的三维反演。M模拟加利福尼亚湾裂谷地壳的厚度。从中新世开始,这条斜裂谷将下加利福尼亚半岛与北美大陆右旋分离,这一时期发生了从基本的延伸构造向现在的超拉伸构造的转变。沿着它的轴线,加利福尼亚湾裂谷在其南部的几个盆地处于早期的海洋化阶段,而在北部海洋地壳的存在是有争议的。由于这种特殊性,海湾海盆地壳和邻近陆地区域的地壳在密度和厚度上都有很大的差异,这是所采用方法的基本参数,因此对每个区域建立了特定的模型。模型生成的皮层厚度与先前的点估计基于地震方法进行检测,98%的点,海洋和陆地87%的模型符合范围为±6公里的差距、差异绝对平均分别为1.5公里和3.5公里。模型中的海湾盆地沿轴线从南向北演化,从海洋过渡地壳特征的超薄地壳(~8 - 12 km)演化到中等薄大陆地壳(~12 - 18 km)。在完成所谓的海湾延伸省的周边延伸地区,大陆地壳通常在~15 - ~28公里之间变化,而在其侧翼,在更厚的地区(西马德雷山脉和科罗拉多高原),地壳可达~35 - 40公里。此外,基于对皮质厚度和区域地质的估计,提出了海湾延伸省的新划界。
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引用次数: 2
A new lithophylacid crab (Crustacea, Decapoda, Portunoidea) from the Late Cretaceous (early Maastrichtian) of Cuba 古巴白垩纪晚期(马斯特里赫特阶早期)的一种新的石纲螃蟹(甲壳纲、十足目、Portunoidea)
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A220620
F. Vega, C. R. Borges-Sellén, Javier Aguilar-Pérez, Alberto F. Arano-Ruiz, Lázaro W. Viñola-López, Torrey Nyborg
Icriobranchiocarcinus rodas Vega n. sp., is recorded from lower Maastrichtian (Upper Cretaceous) Arroyo Grande Formation near the town of Rodas (Central Cuba). I. rodas Vega n. sp. represents additional evidence of paleobiogeographic affinities between Chiapas (SE Mexico) and Cuba, during the Late Cretaceous. The genus Icriobranchiocarcinus Vega, 2018 in Vega et al., 2018 was erected from the type species Icriobranchiocarcinus tzutzu Vega, 2018 from the lower Maastrichtian Ocozocoautla Forma-tion (Chiapas). I. rodas Vega, n. sp. preserves details of ventral morphology as well as more details of chelipeds not reported in I. tzutzu, adding to the morphology of the genus. Icriobranchiocarcinus belong to a family (Lythophylacidae Van Straelen, 1936) that became extinct worldwide during the K/Pg event.
Icriobranchiocarcinus rodas Vega n.sp.,记录自罗德里格斯镇附近的下马斯特里赫特阶(上白垩纪)阿罗约-格兰德组。I.rodas Vega n.sp.代表了晚白垩纪恰帕斯州(墨西哥东南部)和古巴之间古生物地理学亲缘关系的额外证据。Vega et al.,2018中的Icriobranchiocarcinus Vega属,2018是由模式种Icriobranchioccarcinus tzutzu Vega,2018从下马斯特里赫特阶Ocozocoautla Forma tion(恰帕斯州)建立的。I.rodas Vega,n.sp.保留了腹侧形态的细节,以及I.tzutzu中未报道的螯足类的更多细节,增加了该属的形态。Icriobranchiocarcinus属于一个在K/Pg事件期间在全球范围内灭绝的科(Lythophylacidae Van Straelen,1936)。
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引用次数: 1
Karst drainage of lake Chakanbacán and its relation to Icaiche Formation Chakanbacán湖岩溶水系及其与伊才车组的关系
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A021020
R. Leal-Bautista, E. Perry, Jesús Alvarado-Flores, Liliana Alzate-Gavira, J. Domínguez-Maldonado, R. Tapia-Tussell
El repentino colapso del lago Chakanbacán (también conocido como Om o Chakambacab) ocurrió de forma natural y sin previo aviso entre el 19 y el 21 de agosto de 2018. El Lago Chakanbacán, situado al sur de Quintana Roo, 16.5 Km WNW de Nicolás Bravo, Quintana Roo es parte del borde occidental del polje Morocoy-Nuevo Becak. El desplome asociado con el drenaje del lago ha abierto fracturas en la orilla oeste del lago, exponiendo el yeso de la Formación Icaiche. Esta ocurrencia establece la orilla occidental del lago como el afloramiento más oriental conocido del yeso de Icaiche en la zona. El drenaje del lago Chakanbacán parece ser parte de un proceso kárstico que ocurre por rápida disolución y eliminación selectiva de capas de yeso de la Formación Icaiche bajo el lecho del lago. Por lo tanto, el colapso del lago en agosto de 2018 puede demostrar, en tiempo real, un importante proceso de karstificación continuo responsable de una característica geomórologica regional: las numerosas depresiones kársticas drenadas internamente (poljes) de hasta >100 km de largo en Campeche y el sur de Quintana Roo. Se ha propuesto que estos poljes son característicos de colapso resultantes de la eliminación en la solución de yeso de la Formación Icaiche. Estos se producen tanto dentro como adyacentes a una gran área donde la Formación Icaiche se extiende, y, en particular, sobre un estimado de 10000 km2 o más dentro de esa formación donde hay enormes lechos de yeso en la superficie o debajo de una fina capa protectora de roca resistente a la intemperie química.
chakanbacan湖(也被称为Om或Chakambacab)的突然坍塌是在2018年8月19日至21日期间自然发生的,没有任何预警。chakanbacan湖位于金塔纳罗奥南部,nicolas Bravo西北16.5公里,金塔纳罗奥是polje Morocoy-Nuevo Becak西部边缘的一部分。与湖泊排水有关的崩塌在湖泊西岸开辟了裂缝,暴露了伊卡切地层的石膏。这一事件使湖的西岸成为该地区已知的最东端伊卡切石膏露头。chakanbacan湖的排水似乎是喀喀湖过程的一部分,该过程是通过快速溶解和选择性去除湖床下Icaiche地层的石膏层而发生的。因此,湖在2018年8月崩溃可以显示实时的,一个重要进程karstificación geomórologica特征继续负责区域:许多洼地kársticas drenadas内部(poljes)至> 100公里长、金塔纳罗奥州南部。有人提出,这些斑块是由于石膏溶液从Icaiche地层中去除而导致的坍塌的特征。这些都发生在一个大的地方也在附近培训Icaiche蔓延,特别是在预估有一万公里以上培训地方巨大的石膏表面上或床底下的一层薄薄的岩石化学巴氏合金链轮的保护者。
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引用次数: 1
Aspects of the Hydrogeology of southern Campeche and Quintana Roo, Mexico 墨西哥坎佩切南部和金塔纳罗奥的水文地质方面
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A011020
E. Perry, R. Leal-Bautista, G. Velazquez-Oliman, J. Sánchez-Sánchez, Nikklas Wagner
This paper explores strong indirect evidence for existence of a previously unrecognized deep groundwater aquifer in southern Quintana Roo, adjacent parts of Campeche, and (probably) northern Belize. The region contains rocks of Cretaceous-to-Holocene age, including: 1) an up-thrust block of the late Cretaceous carbonate known in Belize as the Barton Creek Formation, which is the oldest formation exposed in the Mexican Yucatán Peninsula, 2) the Cretaceous/Paleogene Albion Formation consisting of weakly consolidated Chicxulub impact air-fall deposits, 3) the Paleocene-Eocene Icaiche Formation, containing a massive 25-35 m thick gypsum member that crops out over an estimated area of more than 10,000 km2 in the elevated interior region of the northern lowlands, and 4) younger rocks of relatively low permeability that flank the region on the east. Hydrogeology is dominated by groundwater and surface flow in and adjacent to the Rio Hondo Fault Zone (RHFZ) and by recharge in the elevated interior region. Groundwater in the elevated region has a high sulfate concentration and is approximately saturated with gypsum dissolved from the Icaiche Formation. High-sulfate groundwater and river water with a slightly lower gypsum saturation index than in the elevated region also occurs in the RHFZ, but no water of comparably high sulfate content is present elsewhere in the study area. This suggests that the elevated region is a recharge zone for high-sulfate groundwater carried eastward beneath a 50 km gap by a deep, previously unrecognized aquifer and then discharged into the RHFZ. Based on chemistry of chloride, sulfate and other ions it is proposed here that a deep aquifer comprising the strongly weathered upper surface of the Barton Creek Formation plus the overlying weakly consolidated Albion Formation connects the elevated recharge area with the RHFZ discharge area. If this composite permeable zone does extend westward beneath the elevated recharge zone, it is probably an excellent aquifer.
本文探索了在金塔纳罗奥州南部、坎佩切州邻近地区和伯利兹北部(可能)存在一个以前未被认识到的深层地下水含水层的强有力的间接证据。该地区包含白垩纪至全新世的岩石,包括:1)晚白垩世碳酸盐岩上冲地块,在伯利兹被称为Barton Creek组,这是墨西哥Yucatán半岛上最古老的地层;2)白垩世/古近纪Albion组,由弱固结的Chicxulub撞击气落沉积组成;包含一个巨大的25-35米厚的石膏构件,在北部低地的高内陆地区估计超过10,000平方公里的面积,以及4)相对低渗透率的年轻岩石,位于东部地区的两侧。洪都断裂带(RHFZ)及其附近的水文地质以地下水和地表水流为主,内陆高架地区以补给为主。高架地区的地下水硫酸盐浓度高,且含有伊蔡彻地层溶解的石膏,接近饱和。高硫酸盐地下水和河水也出现在RHFZ,其石膏饱和指数略低于高发区,但研究区其他地方没有出现较高硫酸盐含量的水。这表明,高架区域是高硫酸盐地下水的补给区,高硫酸盐地下水由以前未被识别的深层含水层向东输送到50公里的缺口下,然后排放到RHFZ。根据氯化物、硫酸盐和其他离子的化学性质,本文提出由Barton Creek组强风化上表面和上覆弱胶结Albion组组成的深层含水层将升高的补给区与RHFZ排放区连接起来。如果这一复合渗透带确实向西延伸至高补给带之下,那么它可能是一个很好的含水层。
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引用次数: 5
Environmental variability during the last three millennia in the rain shadows of central Mexico 墨西哥中部雨影中过去三千年的环境变化
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A171220
G. Olivares-Casillas, A. Correa-Metrio, E. Zawisza, Marta Wojewódka-Przybył, M. Blaauw, F. J. Romero
The last three millennia have been characterized by global temperature oscillations of around one Celsius degree, and high frequency variability on precipitation. Two main temperature anomalies have been reported worldwide, the Medieval Warm Period (MWP) and the Little Ice Age (LIA), characterized by higher and lower than average temperatures, respectively. Precipitation variability has been mostly associated with El Niño anomalies in the Equatorial Pacific. These global variability modes have been modulated by regional factors such as sea surface temperatures and their interaction with continental landmasses. Understanding regional responses to these anomalies would shed light on ecosystem response to environmental variability, a paramount tool for conservation purposes on the light of modern climate change. Here we present a 3,000-year sedimentary record from Lake Metztitlán, located in a Biosphere Reserve under the rain shadow of the Sierra Madre Oriental. Cladoceran and geochemical analyses were used to reconstruct lacustrine dynamics through the time period encompassed by the record. Our record points to highly dynamic lacustrine systems, coupled with global and regional climatic variability. In Metztitlán, the MWP was associated with low lake levels and a high torrentiality of the precipitation reflected in high-frequency peaks of detrital material. The LIA was associated with an enlarged water body, probably as a result of lower evapotranspiration. Overall, global climatic variability resulted in high variability of regional precipitation and detrital input in the Metztitlán region, in turn associated with changes in lake morphometry and depth. Our record highlights the vulnerability of the area to changes in sea surface temperature of the Gulf of Mexico, and to changes in the frequency of El Niño events. Although the effects of global climate change in the region are inescapable, our results emphasize the importance of controlling anthropogenic activities as an additional source of pressure on the regional ecosystems.
过去三千年的特点是全球温度波动约一摄氏度,降水量变化频率高。据报道,世界范围内有两个主要的温度异常,即中世纪暖期(MWP)和小冰期(LIA),其特征分别是高于和低于平均温度。降水变化主要与赤道太平洋的厄尔尼诺异常有关。这些全球变化模式受到区域因素的调节,如海面温度及其与大陆陆地的相互作用。了解区域对这些异常现象的反应将有助于了解生态系统对环境变化的反应,这是根据现代气候变化进行保护的重要工具。在这里,我们展示了Metztitlán湖3000年的沉积记录,该湖位于马德雷山脉(Sierra Madre Oriental)雨影下的生物圈保护区。枝角类和地球化学分析用于重建记录所涵盖的整个时期的湖泊动力学。我们的记录表明,湖泊系统高度动态,加上全球和区域气候变化。在Metztitlán,MWP与低湖水位和碎屑物质高频峰所反映的高降水量有关。LIA与水体增大有关,可能是蒸散量降低的结果。总体而言,全球气候变化导致Metztitlán地区的区域降水和碎屑输入具有高度可变性,进而与湖泊形态计量和深度的变化有关。我们的记录突出表明,该地区易受墨西哥湾海面温度变化和厄尔尼诺事件频率变化的影响。尽管全球气候变化对该地区的影响是不可避免的,但我们的研究结果强调了控制人为活动的重要性,这是对该地区生态系统造成额外压力的来源。
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引用次数: 2
Placas columnares de crinoideos de la Formación Las Delicias, Pérmico inferior y medio de Coahuila, México 墨西哥科阿韦拉下、中二叠纪Las Delicias组海百合柱状板
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-04-01 DOI: 10.18268/BSGM2021V73N1A040820
Rafael Villanueva-Olea, Sara A. Quiroz-Barroso, Jesús Quiroz-Barragán, Miguel A. Torres-Martínez, Francisco Sour-Tovar
Thirteen parataxa of crinoid plates from two localities of the lower-middle Permian of the Las Delicias Formation are described. Both zones are situated in Sierra de las Delicias, to southwestern Coahuila state. The parataxa Pentagonopternix coahuilensis n. sp., Cyclocaudex typicus, C. insaturatus, C. cf. insaturatus, Cyclocaudex sp., Floricyclus diminuta n. sp., Floricyclus sp. Preptopremnum rugosum, P. laeve, Preptopremnum sp., Heterostelechus keithi, Cyclocaudiculus regularis and Epicrinus torreonense new genus and species were found in Las Difuntas locality of the middle Permian (Wordian–Capitanian) whereas Cyclocaudex typicus, C. sp., Preptopremnum laeve and Epicrinus torreonense were also found in Las Sardinas locality whose strata have been dated as early Permian (Kungurian-Roadian). The occurrence of all parataxa in strata from the middle Permian of the Las Delicias Formation allowed extending their stratigraphic range until the Wordian–Capitanian. Most species described have been associated to the Grandian Paleoprovince, nonetheless, the presence of Floricyclus and Pentagonopternix parataxa in the Permian of Coahuila proves the cosmopolitan nature of both genera.
本文描述了Las Delicias组中下二叠统两个地区的13个海百合类板块副群。这两个地区都位于科阿韦拉州西南部的德拉斯德利西亚斯。在中二叠纪(世界- capitian)的Las Difuntas地区发现了副类群Pentagonopternix coahuilensis n. sp., typicus, C. insaturatus, C. cfinsaturatus, cyococaux sp., Floricyclus diminuta ., Floricyclus sp., pretopremum rugosum, P. laeve, pretopremum sp., Heterostelechus keithi, Cyclocaudiculus regularis和Epicrinus torreonense。在Las Sardinas地区还发现了早二叠世(Kungurian-Roadian)地层的pretopremum lave和Epicrinus torreonense。所有副类群在Las Delicias组中二叠世地层中的出现,使它们的地层范围扩大到世界- capitanian。大多数被描述的物种都与格兰底古省有关,尽管如此,在科阿威拉的二叠纪中出现的Floricyclus和Pentagonopternix parataxa证明了这两个属的世界性。
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引用次数: 3
Porphyry-related high-sulfidation mineralization early in Central American Arc development: Cerro Quema deposit, Azuero Peninsula, Panama 中美洲弧发育早期斑岩相关高硫化矿化:巴拿马Azuero半岛Cerro Quema矿床
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2020-11-28 DOI: 10.18268/bsgm2020v72n3a260719
J. Perelló, A. García, R. Creaser
The 70.74 to 70.66 Ma age range for three molybdenite samples accompanying pyrite- and enargite-bearing assemblages effectively constrains an earliest Maastrichtian age for the high-sulfidation Au-Cu mineralization at Cerro Quema, Panama. The epithermal system was contemporaneous with emplacement of a composite dacite dome complex in a geotectonic setting transitional from mafic, primitive intraoceanic (Azuero Protoarc) to more evolved island arc magmatism (Azuero Arc), during initial construction of the Central American land bridge at the trailing edge of the Caribbean Large Igneous Province (CLIP). The molybdenite ages confirm the rapid evolution of the earliest stages of the Central American Arc, from subduction initiation at 75–73 Ma to arc maturation at 71 Ma. A porphyry connection is apparent at Cerro Quema and characterized by highly contorted, banded, and planar quartz-veinlet stockworks and sheeted zones in pyrophyllite- and sericite-bearing patchy-textured rock. These are cut by ledges of quartz, alunite, and dickite, which implies overprinting of the advanced argillic lithocap onto the underlying porphyry environment. Hydrothermal telescoping resulted from synmineralization uplift congruent with an actively emerging volcanic arc, which the Re-Os molybdenite dates accurately constrain at 71 Ma, presumably as a far-field effect of collision between the leading edge of the CLIP with parts of North and South America.
3个辉钼矿样品的70.74 ~ 70.66 Ma年龄范围有效地约束了巴拿马Cerro Quema高硫化金-铜成矿的最早马斯特里赫特年龄。该浅成热液系统与复合英安岩穹顶杂岩的侵位同时发生,处于由基性、原始洋内(Azuero原弧)向更演化的岛弧岩浆作用(Azuero弧)过渡的大地构造背景中,处于加勒比海大火成岩省(CLIP)后缘中美洲陆桥初始构造时期。辉钼矿年龄证实了中美洲弧最早阶段的快速演化,从75-73 Ma的俯冲起始到71 Ma的弧成熟。Cerro Quema的斑岩连接很明显,其特征是在含叶蜡石和绢云母的斑状构造岩石中形成高度扭曲、带状和平面的石英脉入口网和片状带。这些岩石被石英、明矾石和地辉岩的岩壁切割,这意味着晚期泥质岩盖覆盖在下伏斑岩环境上。热液伸展是同矿化隆起引起的,与活跃的火山弧一致,Re-Os辉钼矿日期精确地限制在71 Ma,可能是CLIP前缘与北美和南美部分地区碰撞的远场效应。
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引用次数: 5
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Boletin De La Sociedad Geologica Mexicana
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