Neoarchean and Paleoproterozoic K-rich granites in the Phan Si Pan Complex, north Vietnam: Constraints on the early crustal evolution of the Yangtze Block

Abstract

Precambrian igneous and metamorphic rocks of the Phan Si Pan Complex, North Vietnam, constitute the southern extension of the Yangtze Block, and provide a valuable record of the early evolution of the continental crust. We present results of U-Pb zircon geochronology and geochemistry for Precambrian granites in this complex to constrain their emplacement age and genesis. Granites from three plutonic bodies yielded ages of 2848 ± 15 Ma, 2768 ± 19 Ma and 1869 ± 30 Ma, which represent newly-recognized late Archean to the disparate terranes and final cratonization of the Yangtze Block overlaps with, and may be related to, assembly of the Nuna supercontinent.

Detrital zircon provenance of metasedimentary rocks in the Proterozoic Caiziyuan‐Tongan accretionary complex: Constraints on crustal and tectonic evolution of the Yangtze Block, South China

“…Widespread 2.8–2.6 Ga detrital, inherited, and xenocrystal zircons indicate that tectonothermal events occurred extensively in the Yangtze Block during the Neoarchean era (Wang et al, 2020; Wang, Dong, Yao, & Zhao, 2020; Xiang et al, 2018; Zheng et al, 2006), representing a significant period for crustal growth and reworking similar to many other major Archean cratons worldwide (Condie et al, 2009). This view has been further supported by a growing number of Neoarchean magmatic rocks that have been recently identified within the Kongling (Chen, Gao, et al, 2013; Gao et al, 2011; Guo et al, 2015), Zhongxiang (Huang et al, 2020; Wang, Deng, et al, 2018; Wang, Li, et al, 2018; Zhou et al, 2015), Yudongzi (Chen et al, 2019; Hui et al, 2017; Zhou et al, 2018), and Phan Si Pan (Zhao et al, 2019) complexes. Thus, these detrital zircons may have been mostly sourced from the Neoarchean rock components of the Yangtze Block itself.…”

“…The contemporary granitoid rocks in the Yudongzi Complex mostly show negative zircon ε Hf ( t ) values with T DM2 model ages of ca. 3.64–2.80 Ga (Chen et al, 2019; Hui et al, 2017; Zhou et al, 2018), while the ~2.77 Ga potassic granite within the Phan Si Pan Complex has uniform zircon ε Hf ( t ) values from −3.9 to −0.1 and T DM2 model ages of 3.45–3.20 Ga (Zhao et al, 2019). All these data reveal that crustal reworking may have been prevalent during the Neoarchean, with some juvenile additions to the crust.…”

“…Such a tendency commonly indicates intense crustal reworking (Figure 7a), possibly caused by rapid crustal thickening (Collins, Belousova, Kemp, & Murphy, 2011). Many studies have revealed that collision‐related magmatism and metamorphism may have been dominant in the Yangtze Block at 2.0–1.8 Ga (e.g., Cui et al, 2020; Cui, Wang, et al, 2021; Han et al, 2019; Huang et al, 2019; Hui et al, 2017; Wang & Dong, 2019; Wang et al, 2015, 2016; Wu et al, 2008; Yin, Lin, Davis, Zhao, et al, 2013; Zhao et al, 2019; Zhou et al, 2017). These observations lead to a consensus that one significant episode of craton‐scale orogeny may have occurred in the Yangtze Block during 2.0–1.8 Ga (Cawood et al, 2018, 2020; Cui, Wang, et al, 2021; Han et al, 2019; Wang & Dong, 2019; Wang, Dong, Yao, & Zhao, 2020), synchronous with the global orogenic events that resulted in the amalgamation of Nuna supercontinent (Zhao et al, 2002) (Figure 8).…”

“…The South China Block consists of the Yangtze Block to the northwest and the Cathaysia Block to the southeast, which amalgamated along the Jiangnan/Sibao Orogenic Belt in the early to middle Neoproterozoic (Li et al, 2007; Yao, Cawood, Shu, & Zhao, 2019; Yin et al, 2013; Zhao & Cawood, 2012) (Figure 1a). Archean to early Paleoproterozoic rocks sporadically crop out in the Yangtze Block and are represented by the 3.45–2.62 Ga Kongling Complex (Chen et al, 2013; Gao et al, 2011; Guo et al, 2014, 2015) and 2.90–2.65 Ga Zhongxiang Complex (Huang et al, 2020; Wang et al, 2018; Wang et al, 2018; Zhou et al, 2015) to the north, the 2.5 Ga Douling Complex (Wu et al, 2014) and 2.82–2.48 Ga Yundongzi Complex (Chen et al, 2019; Hui et al, 2017, 2019; Zhou et al, 2018) to the northwest, and the 3.11–2.22 Ga Cuoke Complex (Cui et al, 2019, 2020; Cui, Wang, et al, 2021) and 2.91–2.2 Ga Phan Si Pan Complex (Wang et al, 2016; Zhao et al, 2019) to the southwest (Figure 1a). Most of these complexes experienced regional metamorphism and collision‐related magmatism at ca.…”

Evolution of supracrustal rocks of the Indochina Block: Evidence from new detrital zircon U–Pb ages of the Kontum Massif, Central Vietnam

“…1a). Although the Precambrian evolutionary history of the South China Block side has been reported (Hieu et al, 2012;Zhao et al, 2019aZhao et al, , 2019bHieu et al, 2020b;Minh et al, 2020b), data from the Indochina Block side is extremely poor as mentioned above. To provide important constraints on the Precambrian crustal formation of the Southeast Asian continent, precise understandings of the Precambrian crustal growth history of the Indochina Block side are necessary.…”