The acceptance of our paper by Communications Earth & Environment filled me with complex emotions. It represents not only recognition of our scientific discovery but also a testament to an exploration journey spanning nearly two decades—one that intertwines personal and academic paths. This article was born from a serendipitous field discovery, a set of long-shelved data, a bold hypothesis, and the extraordinary strength drawn from family during the most trying times.
I. Prologue: A supervisor’s westward journey and shelved data
Our story begins with my supervisor, Professor Taiyi Luo from the Institute of Geochemistry, Chinese Academy of Sciences. In 2016, driven by a geologist’s pure curiosity, he embarked on a field expedition westward from Guiyang, China. His goal was not utilitarian but sprang from a deep interest in the Earth’s stories. At the Mucheng section in Yunnan Province, within the Baoshan Block, he keenly identified a thin layer of clayrock within the cherts of the Gongyanghe Group (Fig. 1). Drawing on his experience, he recognised it as a potential K-bentonite—a special rock formed from the settling and alteration of ancient volcanic ash, acting like a geological “time capsule” that preserves the secrets of volcanic eruptions.
Professor Luo collected samples. Subsequent analysis revealed exquisite volcanic zircon crystals within, with dating results pointing to approximately 520 million years ago, in the Early Cambrian. It was an interesting find, but initially its significance seemed limited. The data were shelved, as a single age alone could hardly piece together a grander narrative. It was not until 2021 that Professor Luo handed this dataset to me, hoping I could extract more value from it. Yet, at that time, I too failed to immediately perceive its deeper meaning.
Fig. 1. A K-bentonite layer in the Gongyanghe Group at the Mucheng section, Baoshan Block, located at the position marked by the geological hammer.
II. Connection: When a Baoshan clue meets a long-standing South China puzzle
My team at Guizhou Normal University has long focused on the Early Cambrian strata of the Yangtze Block in South China. At the base of the Niutitang, Shiyantou, and Shuijingtuo formations, at least one layer of K-bentonite is also widely distributed. These layers represent intense volcanic activity during the early Cambrian. More strikingly, this specific horizon coincides with a famous enigma in Earth’s history: the ‘Strangelove ocean’ event. In 1985, Professor Kenneth J. Hsu and colleagues proposed in Nature that during the early Cambrian, the oceans may have turned “lifeless”, with collapsed primary productivity and drastically reduced life. The initial hypothesis attributed this to an extraterrestrial impact, but subsequent research—including our team’s work in 2014—found no conclusive impact evidence.
Thus, a major scientific mystery remained: if not an extraterrestrial visitor, what caused the early oceans to suffocate?
In 2023, as my PhD student Di Zhang needed to define his doctoral research direction, I faced a crucial choice for him. Two paths lay ahead. One was a safe, conventional route: systematically analysing the existing K-bentonite data, which was sufficient for publishing a solid paper. The other was far more challenging: attempting to link the K-bentonite in the Baoshan Block with the widespread K-bentonites in the Yangtze Block and that mysterious ‘Strangelove ocean’.
I presented the choice to Di Zhang. A few days later, he returned with a determined look and chose the latter path. It was this courageous decision that opened the door to our breakthrough.
III. Breakthrough: Reconstructing super-eruptions and deciphering the Strangelove enigma
We commenced intensive work. First, we supplemented and systematically analysed K-bentonite samples from the Mucheng section in the Baoshan Block and from three sections in the Yangtze Block: Meishucun, Songlin, and Taoying. We obtained a comprehensive dataset, including zircon U–Pb ages, trace-element contents, Hf isotopes, whole-rock clay-mineral compositions, and major- and trace-element contents.
A remarkable consistency emerged. All these K-bentonites, distributed across different tectonic blocks over a thousand kilometres apart, shared an age around 520 million years. Their geochemical signatures pointed to a common source, indicating they originated from volcanic activities with similar magma compositions and tectonic settings. This meant we had discovered not a local flicker, but a continent-scale “explosive super-eruption” event that swept across the northwestern margin of Gondwana. This was likely a single event, or more probably, several very closely spaced eruptions.
We now held the key to deciphering the ‘Strangelove ocean’ puzzle. We proposed a complete causal chain:
- Super-eruptions occurred on the northwestern margin of Gondwana, injecting enormous volumes of volcanic ash into the atmosphere.
- This fine-grained ash settled widely across the Earth’s surface, particularly into the oceans. Due to its specific physico-chemical properties, the ash weathered rapidly, releasing large amounts of nutrients, such as phosphorus.
- This excessive nutrient input into the oceans could trigger massive algal overgrowth (blooms). As these algae died, their organic remains settled and decomposed, drastically depleting seawater oxygen and potentially generating hydrogen sulfide. This led to widespread marine anoxia and even euxinia.
- Finally, such a hostile marine environment would prove fatal to much of the early marine life, thus inducing the ‘Strangelove ocean’ event.
Our study provides a robust geobiological mechanism for the ‘Strangelove ocean’ based on a super-eruption. The final publication of this paper owes much to the reviewers’ constructive suggestions, which prompted us to further consider multiple environmental effects like volcanic sulfur dioxide and toxic element release, thereby refining our model.
IV. Behind the scenes: An indispensable team and light in dark times
This achievement is the fruit of close teamwork. My PhD student Di Zhang, as the first author, undertook a massive amount of experimental data analysis and initial draft writing. His dedication and diligence formed the foundation of the research. My supervisor, Professor Luo, is the co-corresponding author. He is not only the starting point of this research—having provided the key samples and data—but the spirit of pure geological exploration embodied in his westward journey has always inspired us. As one of the corresponding authors, I was responsible for proposing the core scientific hypothesis, integrating the research framework, and painstakingly refining the paper’s logic and presentation. Our work also benefited greatly from the contributions of our co-authors.
However, during the most critical period of this research, my personal life faced a tremendous challenge: my wife was diagnosed with a serious illness. Those times were exceptionally difficult. It was my wife who, with astonishing perseverance and optimism, silently bore so much. She never complained. Instead, she often encouraged me not to abandon my research. The heroic spirit she displayed in her fight against illness became the most powerful source of strength within me. This strength also sustained my team, enabling us to persist and persevere in the face of daunting academic challenges.
Mingzhong Zhou
January 27, 2026
Guiyang