Article
Geosciences, Multidisciplinary
Wieslawa Radmacher, Osmin J. Vasquez, Mario Tzalam, Mireya Jolomna, Anny Molineros, James S. Eldrett
Summary: Organic palynological content in rocks is crucial for sediment dating, paleoenvironmental reconstructions, and hydrocarbon potential determination. However, the palynological signal may be affected by various diagenetic processes, leading to the need for further discussion and analysis.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geology
Daniel Tabara, S. Vasile, Z. Csiki-Sava, R. Balc, M. Vremir, M. Chelariu
Summary: A palynological and organic geochemical study was conducted on the Upper Cretaceous deposits in the southwestern part of the Transylvanian Basin. The study provided insights into the depositional environments of the studied area, showing that the lower and middle sections of the Bozes Formation were deposited in a distal, outer neritic area, while the topmost part represents a nearshore/inner neritic sequence.
CRETACEOUS RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Mohammed Hail Hakimi, Atif N. Abass, Aref Lashin, Abbas F. Gharib, Ahmed E. Radwan, Afikah Rahim, Adeeb Ahmed, Lanre Asiwaju, Wafaa E. Afify
Summary: This study examines the potential for thermogenic gas generation from the Al Renk shales in the Melut Basin, South Sudan, using organic geochemical and basin modelling results. The research shows that the Al Renk shales are good gas-source rocks with high total organic carbon content. However, the study also highlights the contrast between the source of organic matter and the depositional environment. High thermal maturation is crucial in altering the original organic matter and decreasing hydrogen index values. The findings suggest the need for conventional gas exploration in deeper stratigraphic successions in the Melut Basin.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geology
Fernando R. Rios, Ana M. P. Mizusaki, Rualdo Menegat, Isaque C. Rodrigues
Summary: This study examines the temporal and spatial relationships between fluvio-aeolian, aeolian, and volcanic systems in the southernmost part of the Parana Basin during the Late Jurassic and Early Cretaceous. By analyzing facies and architectural elements, the evolution of the volcano-sedimentary record is reconstructed.
CRETACEOUS RESEARCH
(2024)
Article
Paleontology
Eduardo Premaor, Javier Helenes, Paulo A. Souza, Wolfgang Kalkreuth
Summary: The study found that dinoflagellate cysts assigned to the subfamily Protoperidinioideae are abundant in Miocene coastal deposits in southern Brazil, with a high richness of this subfamily. The analysis of 49 taxa identified in 18 samples indicates a middle Miocene age for these samples.
MARINE MICROPALEONTOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Tu-Ahn Nguyen, Michael B. W. Fyhn, Jeppe Agard Kristensen, Lars Henrik Nielsen, Tonny B. Thomsen, Nynke Keulen, Sofie Lindstrom, Lars O. Boldreel
Summary: The study investigates the provenance of Lower Cretaceous deposits in the Phuquoc Basin, revealing that the Qinling-Dabie and Songpan-Ganzi orogenic belts were major sources of sediment in the Early Cretaceous. The analysis of detrital zircon and heavy mineral compositions suggests a common sediment source with Khorat and Sichuan basins, and similarities with mid-Cretaceous strata in the Lanping-Simao Basin. This supports the idea that the Phuquoc, Khorat, Sichuan, and possibly the Lanping-Simao basins were part of a Cretaceous basin in central SE Asia.
Article
Geology
Valeria S. Perez Loinaze, Magdalena Llorens, Jose I. Cuitino, M. Veronica Guler, Juan Cruz Villan
Summary: Palynomorph assemblages recovered from the upper levels of the Cretaceous Rio Mayer Formation in the Rio Lista area, southern Argentina, suggest an early Aptian age and a progressively shallowing marine setting for deposition of the unit, as evidenced by the decrease in abundance of marine elements and the increase of Pterospermella. These interpretations are consistent with sedimentological analyses of the same stratigraphic section.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Ivan Rodriguez-Barreiro, Artai A. Santos, Ma Eugenia Arribas, Ramon Mas, Jose Arribas, Uxue Villanueva-Amadoz, Fidel Torcida Fernandez-Baldor, Jose B. Diez
Summary: This study conducted sedimentological and palynostratigraphic research on the Tera Group in the West Cameros Basin. The results show significant changes in sedimentary facies and palynological assemblages during the Jurassic-Cretaceous boundary transition, and suggest that the Jaramillo Formation belongs to the lower Berriasian.
CRETACEOUS RESEARCH
(2022)
Article
Geography, Physical
Alexander Wheeler, Jian Shen, Tim A. Moore, Ofentse M. Moroeng, Jingjing Liu
Summary: In this study, we analyzed the palynology, organic petrography, and carbon isotopes of the #16 Seam in the Hailar Basin, Inner Mongolia, China. Our results showed a diverse microflora consisting of ferns, conifers, horsetails, lycopsids, bryophytes, ginkgoes, and cycads. The accumulation of the coal was likely controlled by rising water table, flooding, and fires. The top of the coal seam indicated the gradual drowning of the paleomire. Interestingly, no angiosperm pollen was found in the samples, suggesting they were not adapted to the extreme conditions of the mire.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Oladapo O. Akinlotan, Stuart J. Hatter
Summary: This study uses the Wealden Sandstones in the Wessex Basin in England as an example to investigate the depositional controls on diagenetic evolution in sedimentary basins. The results indicate that sedimentary processes play a crucial role in determining the development of authigenic minerals in sandstones, and detrital mineralogy and shallow burial depth are important factors controlling diagenesis.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Multidisciplinary Sciences
Kai Yan, Chun-lian Wang, Steffen Mischke, Jiu-yi Wang, Li-jian Shen, Xiao-can Yu, Ling-yang Meng
Summary: The geochemistry of the late Cretaceous lower Zhoutian Formation in the Jitai Basin of Southeast China was analyzed to infer the sediment provenance and reconstruct the paleoenvironment and paleoclimate. The study revealed fluctuating climate and salinity changes during the late Cretaceous period, with distinct changes in lower and upper parts of the formation. The data suggests a mixture of felsic upper crust sediments and older sedimentary rocks as the main provenance of the sediments.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Zhongsheng Shi, Lirong Dou, Jianglong Shi, Jie Bai, Luo Xue, Bintao Chen, Dingsheng Cheng, Wenzhu Pang, Lun Ma, Lei Wang
Summary: This study analyzed the geochemical characteristics of oils from the Palogue Oilfield and its neighboring Moleeta and Jamous lows in the Melut Basin, Africa. The results showed that the oils of the Palogue Oilfield have mixed-source features, with similarities to the oils from the Jamous low. Furthermore, it was found that high-maturity oils in the Palogue Oilfield may have originated from the source rocks in the Jamous low.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geology
Seyed Naser Raisossadat, Jean-Louis Latil, Hayat Hamdani, Etienne Jaillard, Hassan Amiribakhtiar
Summary: In the Zagros Basin in southwestern Iran, a 270 m thick section of shales has yielded a diverse ammonite fauna, allowing for a detailed biostratigraphic zonation. The findings include Aptian and Albian age indicators based on the ammonite families found in the sediment layers.
CRETACEOUS RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Lirong Dou, Xinshun Zhang, Kunye Xiao, Dangpeng Xi, Yebo Du, Li Wang, Jie Hu, Ying Hu, Qianyu Zheng
Summary: Based on a systematic palynological analysis, this study reveals a shift from arid to humid climate in Central Africa during the late Aptian to early Albian, which is consistent with the results from South America.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Mingzhen Zhang, Shuang Dai, Xianwen Zhang, Sen Wang, Zhen Du, Bo Ma, Baoxia Du
Summary: This study presents a palynological report from the middle Zhidan Group in central China, suggesting that it dates back to the middle Early Cretaceous. The vegetation reconstruction indicates conifer-dominated forests in a relatively stable, cold, and slightly humid environment, likely due to the cool global climate during the middle Early Cretaceous.
GEOLOGICAL JOURNAL
(2021)