为系统揭示大别地区经历的岩浆构造热事件及地壳生长历程，进而为大别地区乃至扬子克拉通的地壳生长提供新证据。对大别地区3条不同河流碎屑沉积物中的锆石开展U-Pb-Hf同位素分析，得到185组谐和度大于90%的锆石U-Pb年龄以及82组Hf同位素年龄。此外，我们还收集并整合了前人的研究数据，包括594组锆石U-Pb年龄和528组Hf同位素数据进行综合分析。
", "ds_source": "1.样品经粉碎、淘洗后，采用重选和磁选技术进行初步分选，然后于双目镜下手工挑选。将代表性锆石粘在环氧树脂上进行制靶，抛光使其暴露 1/3~1/2 晶面，进行显微照相。其中阴极发光图像拍摄仪器为配备有GATAN MINICL系统的高真空扫描电子显微镜（JSM-IT100）。\n
2.锆石U-Pb定年分析利用RESOlution LR 193 nm 激光剥蚀系统和ICAP-Q电感耦合等离子体质谱的联用装置（LA-ICP-MS）完成。分析所用激光束斑直径为 29 µm，激光束能量密度4 J/cm2，频率为3 Hz。样品测试时，每个点的分析时间为90 s，其中背景信号15 s，样品剥蚀45 s，尾吹30s。锆石 U-Pb 定年分析采用锆石标准物质 91500 为外标进行同位素分馏校正。锆石样品的同位素比值和元素含量采用软件ICPMSDataCal进行数据处理分析。U-Pb 谐和年龄和加权平均年龄计算及绘图采用软件 Isoplot 3.0 完成。使用EXCEL 程序ComPbCorr#3_15G 进行普通铅校正。对≥1 000 Ma的锆石，选择207Pb/206Pb年龄，对小于1 000 Ma的锆石选择206Pb/238U年龄，并剔除协和度小于90%的年龄，最后采用Isoplot R做碎屑锆石年龄频率直方图与年龄谐和图。\n
3.锆石Lu-Hf同位素分析利用RESOlution LR 193 nm 激光剥蚀系统和ICAP-Q电感耦合等离子体质谱的联用装置（LA-ICP-MS）完成。激光束斑直径为43 µm，激光剥蚀时间60 s，激光频率6 Hz，激光能量密度为4 J/cm2。分析过程中采用锆石标准物质 Plešovice、Penglai 作为监控样，锆石Hf同位素数据处理分析采用软件 ICPMSDataCal 完成。
", "ds_process_way": "将代表性锆石粘在环氧树脂上进行制靶，抛光使其暴露 1/3~1/2 晶面。
", "ds_quality": "对≥1 000 Ma的锆石，选择KM207Pb/KM206Pb年龄，对小于1 000 Ma的锆石选择KM206Pb/KM238U年龄，并剔除协和度小于90%的年龄。
", "ds_acq_start_time": "2022-09-10 00:00:00", "ds_acq_end_time": "2023-05-01 00:00:00", "ds_acq_place": "湖北省麻城市", "ds_acq_lon_east": 115.75416666666666, "ds_acq_lat_south": 30.790277777777778, "ds_acq_lon_west": 115.19055555555556, "ds_acq_lat_north": 30.7575, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 482637, "ds_files_count": 3, "ds_format": ".xlsx", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "daf25aa1-9ece-497b-aaf0-2ccdc2324d68.jpg", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "52b7b79b-860c-49a5-9083-9a70cf8bed5a", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.5034" ], "quality_level": 3, "publish_time": "2024-12-03 14:23:29", "last_updated": "2025-04-24 16:15:06", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.GEOCHEM.DB6651.2024", "i18n": { "en": { "title": "Structure and crustal evolution in the Dabie region: constraints from U-Pb Hf isotopes of river detrital zircons (2022-2023)", "ds_format": ".xlsx", "ds_source": "After crushing and washing, the sample is preliminarily sorted using reselection and magnetic separation techniques, and then manually selected under binocular vision. Stick representative zircons onto epoxy resin for target preparation, polish to expose 1/3~1/2 crystal planes, and perform microscopic photography. The cathodoluminescence imaging instrument is a high vacuum scanning electron microscope (JSM-IT100) equipped with GATAN MINICL system.\n
2. Zircon U-Pb dating analysis was carried out using a combined device of RESOLution LR 193 nm laser ablation system and ICAP-Q inductively coupled plasma mass spectrometry (LA-ICP-MS). The laser beam spot diameter used for analysis is 29 µ m, the laser beam energy density is 4 J/cm2, and the frequency is 3 Hz. During sample testing, the analysis time for each point is 90 seconds, including 15 seconds for background signal, 45 seconds for sample erosion, and 30 seconds for tail blowing. Zircon U-Pb dating analysis uses zircon reference material 91500 as an external standard for isotope fractionation correction. The isotopic ratios and elemental contents of zircon samples were analyzed using the ICPMSDataCal software for data processing. The calculation and plotting of U-Pb harmonic age and weighted average age were completed using the software Isoplot 3.0. Use the EXCEL program ComPbCorr # 3_15G for regular lead correction. For zircons greater than or equal to 1000 Ma, select207Pb/206Pb age. For zircons less than 1000 Ma, select206Pb/238U age, and exclude ages with a Concordance less than 90%. Finally, use Isoplot R to create a detrital zircon age frequency histogram and age harmonic plot.\n
3. Zircon Lu Hf isotope analysis was performed using a combined device of RESOLution LR 193 nm laser ablation system and ICAP-Q inductively coupled plasma mass spectrometry (LA-ICP-MS). The laser beam spot diameter is 43 µ m, the laser ablation time is 60 s, the laser frequency is 6 Hz, and the laser energy density is 4 J/cm2. During the analysis process, zircon standard materials Ple š ovice and Penglai were used as monitoring samples, and zircon Hf isotope data processing and analysis were completed using software ICPMSDataCal.", "ds_quality": "
For zircons larger than or equal to 1000 Ma, select the KM207Pb/KM206Pb age. For zircons smaller than 1000 Ma, select the KM206Pb/KM238U age, and exclude ages with a Concordance of less than 90%.", "ds_ref_way": "", "ds_abstract": "
To systematically reveal the magmatic tectonic thermal events and crustal growth processes experienced in the Dabie region, and provide new evidence for crustal growth in the Dabie region and even the Yangtze craton. U-Pb Hf isotope analysis was conducted on zircons from detrital sediments of three different rivers in the Dabie region, resulting in 185 sets of zircon U-Pb ages with a harmonic degree greater than 90% and 82 sets of Hf isotope ages. In addition, we also collected and integrated previous research data, including 594 zircon U-Pb ages and 528 Hf isotope data for comprehensive analysis.
", "ds_time_res": "", "ds_acq_place": "Macheng City, Hubei Province", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Stick representative zircons onto epoxy resin for target preparation, polish to expose 1/3~1/2 crystal planes.", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "ds_topic_tags": [ "大别地区", "U-Pb-Hf同位素", "地壳演化", "岩浆变质事件" ], "ds_subject_tags": [ "沉积学" ], "ds_class_tags": [], "ds_locus_tags": [ "湖北省麻城市" ], "ds_time_tags": [ 2022, 2023 ], "ds_contributors": [ { "true_name": "汪子祺", "email": "wiskywang@foxmail.com", "work_for": "中国地质大学（武汉）地球科学学院", "country": "中国" }, { "true_name": "田洋", "email": "41834572@qq.com", "work_for": "中国地质调查局武汉地质调查中心", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "汪子祺", "email": "wiskywang@foxmail.com", "work_for": "中国地质大学（武汉）地球科学学院", "country": "中国" }, { "true_name": "田洋", "email": "41834572@qq.com", "work_for": "中国地质调查局武汉地质调查中心", "country": "中国" } ], "ds_managers": [ { "true_name": "汪子祺", "email": "wiskywang@foxmail.com", "work_for": "中国地质大学（武汉）地球科学学院", "country": "中国" }, { "true_name": "田洋", "email": "41834572@qq.com", "work_for": "中国地质调查局武汉地质调查中心", "country": "中国" } ], "category": "水文" }